Quarterly report pursuant to Section 13 or 15(d)

Debt - Unsecured Notes (Details)

v3.22.2.2
Debt - Unsecured Notes (Details) - USD ($)
2 Months Ended 3 Months Ended 9 Months Ended
Dec. 23, 2021
Nov. 23, 2021
Apr. 26, 2021
Dec. 08, 2020
Jul. 23, 2020
Jan. 22, 2020
Oct. 08, 2019
Apr. 10, 2019
Aug. 17, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Jun. 11, 2021
Jan. 31, 2018
Dec. 21, 2017
Debt Instrument [Line Items]                                  
Notional Amount                   $ 900,000,000   $ 900,000,000   $ 900,000      
2023 Notes | Unsecured debt investments                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                                 $ 138,500,000
2023 Notes | Unsecured debt investments                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount   $ 150,000,000                           $ 11,500,000 $ 150,000,000
Interest rate, stated percentage                                 4.75%
Debt redeemed $ 150,000,000                   $ 1,000,000   $ 3,000,000        
Debt asset coverage (in percentage) 100.00% 100.00%                              
2023 Notes | Unsecured debt investments | Interest Rate Swap                                  
Debt Instrument [Line Items]                                  
Notional Amount                                 $ 150,000,000
Fixed interest rate                                 4.75%
2023 Notes | Unsecured debt investments | Maximum                                  
Debt Instrument [Line Items]                                  
Interest rate, stated percentage                                 5.50%
2023 Notes | Unsecured debt investments | LIBOR | Interest Rate Swap                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate                                 2.545%
2024 Notes | Unsecured debt investments                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount               $ 400,000,000   400,000,000   400,000,000   400,000,000      
Interest rate, stated percentage               5.25%                  
Debt redeemed                   0 0 4,300,000 4,300,000        
Debt asset coverage (in percentage)               100.00%                  
2024 Notes | Unsecured debt investments | Interest Rate Swap                                  
Debt Instrument [Line Items]                                  
Notional Amount               $ 400,000,000                  
Fixed interest rate               5.25%                  
Fair value, net                   (12,700,000)   (12,700,000)   12,000,000.0      
2024 Notes | Unsecured debt investments | LIBOR | Interest Rate Swap                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate               2.937%                  
2024 Notes | Unsecured debt investments | Treasury Rate                                  
Debt Instrument [Line Items]                                  
Basis points               0.0050                  
2025 Notes | Unsecured debt investments                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount             $ 425,000,000     425,000,000   425,000,000   425,000,000      
Interest rate, stated percentage             4.00%                    
Debt asset coverage (in percentage)             100.00%                    
2025 Notes | Unsecured debt investments | Treasury Rate                                  
Debt Instrument [Line Items]                                  
Basis points             0.0040                    
2027 Notes | Unsecured debt investments                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount     $ 500,000,000             500,000,000   500,000,000   500,000,000      
Interest rate, stated percentage     2.625%                            
Debt redeemed                   1,000,000.0 $ 900,000 3,100,000 $ 900,000        
Debt asset coverage (in percentage)     100.00%                            
2027 Notes | Unsecured debt investments | Interest Rate Swap                                  
Debt Instrument [Line Items]                                  
Notional Amount     $ 500,000,000                            
Fixed interest rate     2.625%                            
Fair value, net                   (61,100,000)   (61,100,000)   7,600,000      
2027 Notes | Unsecured debt investments | LIBOR | Interest Rate Swap                                  
Debt Instrument [Line Items]                                  
Basis spread on variable rate     1.655%                            
2027 Notes | Unsecured debt investments | Treasury Rate                                  
Debt Instrument [Line Items]                                  
Basis points     0.0030                            
July 2025 Notes | Unsecured debt investments                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount           $ 500,000,000       500,000,000   500,000,000   500,000,000      
Interest rate, stated percentage           3.75%                      
Debt asset coverage (in percentage)           100.00%                      
July 2025 Notes | Unsecured debt investments | Treasury Rate                                  
Debt Instrument [Line Items]                                  
Basis points           35                      
2026 Notes | Unsecured debt investments                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount         $ 500,000,000         500,000,000   500,000,000   500,000,000      
Interest rate, stated percentage         4.25%                        
Debt asset coverage (in percentage)         100.00%                        
2026 Notes | Unsecured debt investments | Treasury Rate                                  
Debt Instrument [Line Items]                                  
Basis points         0.0050                        
July 2026 Notes | Unsecured debt investments                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount       $ 1,000,000,000           1,000,000,000   1,000,000,000   1,000,000,000      
Interest rate, stated percentage       3.40%                          
Debt asset coverage (in percentage)       100.00%                          
July 2026 Notes | Unsecured debt investments | Treasury Rate                                  
Debt Instrument [Line Items]                                  
Basis points       0.0050                          
2028 Notes | Unsecured debt investments                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                 $ 400,000,000 $ 850,000,000   $ 850,000,000   $ 850,000,000 $ 450,000,000    
Interest rate, stated percentage                 2.875%                
Debt asset coverage (in percentage)                 100.00%                
2028 Notes | Unsecured debt investments | Treasury Rate                                  
Debt Instrument [Line Items]                                  
Basis points                 0.0030