v3.25.2
Debt Obligations - Schedule of Long-term Debt Instruments (Details)
1 Months Ended 6 Months Ended
Mar. 04, 2024
USD ($)
Apr. 14, 2023
USD ($)
Jul. 31, 2025
USD ($)
Apr. 30, 2025
USD ($)
Aug. 31, 2014
USD ($)
creditFacility
Jun. 30, 2025
USD ($)
tranche
May 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 05, 2024
USD ($)
Debt Instrument, Redemption [Line Items]                  
Number of tranches | tranche           2      
Line of Credit                  
Debt Instrument, Redemption [Line Items]                  
Borrowing Capacity           $ 3,330,000,000      
Line of credit facility, commitment fee percentage           0.30%      
Line of Credit | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate           1.00%      
Line of Credit | Federal Funds Rate                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate           0.50%      
Line of Credit | Maximum | Base Rate                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate           2.00%      
Line of Credit | Maximum | Risk-Free Rate                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate           3.00%      
Line of Credit | Maximum | Sterling Overnight Index Average                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate           3.00%      
Line of Credit | Minimum | Base Rate                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate           1.00%      
Line of Credit | Minimum | Risk-Free Rate                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate           2.00%      
Line of Credit | Minimum | Sterling Overnight Index Average                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate           2.00%      
Secured Debt                  
Debt Instrument, Redemption [Line Items]                  
Carrying Value           $ 1,610,589,000   $ 1,281,984,000  
Debt instrument, call option, interest rate, percentage           4.00%      
Senior Unsecured Revolving Credit Facility | Line of Credit                  
Debt Instrument, Redemption [Line Items]                  
Borrowing Capacity           $ 1,750,000,000      
Carrying Value           $ 380,000,000   $ 0  
Interest Rate           5.37%   5.43%  
Senior Unsecured Revolving Credit Facility | Line of Credit | Revolving Credit Facility                  
Debt Instrument, Redemption [Line Items]                  
Borrowing Capacity           $ 1,750,000,000 $ 1,650,000,000    
Proceeds from issuance of long-term debt           $ 380,000,000      
Senior Unsecured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Subsequent Event                  
Debt Instrument, Redemption [Line Items]                  
Proceeds from issuance of long-term debt     $ 250,000,000            
Repayments of long-term debt     $ 60,000,000            
Senior Unsecured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Maximum | Base Rate                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate           0.25%      
Senior Unsecured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Maximum | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate           1.25%      
Debt instrument, basis spread on variable rate, per annum adjustment           0.10%      
Senior Notes due 2034 | Senior Notes                  
Debt Instrument, Redemption [Line Items]                  
principal amount           $ 600,000,000     $ 600,000,000
Carrying Value           $ 594,375,000   $ 594,051,000  
Interest Rate           5.88%   5.88% 5.875%
Junior Subordinated Notes due 2064 | Subordinated Debt                  
Debt Instrument, Redemption [Line Items]                  
principal amount $ 400,000,000         $ 400,000,000      
Carrying Value           $ 390,185,000   $ 390,058,000  
Interest Rate 6.95%         6.95%   6.95%  
Interest deferral period 5 years                
Junior Subordinated Notes due 2064 | Subordinated Debt | Debt Instrument, Redemption, Period One                  
Debt Instrument, Redemption [Line Items]                  
Redemption price, percentage 100.00%                
Junior Subordinated Notes due 2064 | Subordinated Debt | Debt Instrument, Redemption, Period Two                  
Debt Instrument, Redemption [Line Items]                  
Redemption price, percentage 102.00%                
Secured Notes - Tranche A | Secured Debt                  
Debt Instrument, Redemption [Line Items]                  
Borrowing Capacity           $ 200,000,000      
principal amount           200,000,000      
Carrying Value           $ 196,807,000   $ 196,683,000  
Interest Rate           5.33%   5.33%  
Secured Notes - Tranche B | Secured Debt                  
Debt Instrument, Redemption [Line Items]                  
Borrowing Capacity           $ 50,000,000      
principal amount           50,000,000      
Carrying Value           $ 49,222,000   $ 49,192,000  
Interest Rate           4.75%   4.75%  
364-Day Revolving Credit Facility | Line of Credit                  
Debt Instrument, Redemption [Line Items]                  
Borrowing Capacity   $ 150,000,000   $ 300,000,000   $ 300,000,000      
Carrying Value           $ 0   $ 52,000,000  
Interest Rate           6.32%   6.33%  
Debt instrument, term   364 days   364 days          
Subordinated Credit Facility | Line of Credit                  
Debt Instrument, Redemption [Line Items]                  
Borrowing Capacity           $ 30,000,000      
Carrying Value           $ 0   $ 0  
Interest Rate           6.67%   6.68%  
Subordinated Credit Facility | Subordinated Debt | Revolving Credit Facility                  
Debt Instrument, Redemption [Line Items]                  
Borrowing Capacity         $ 30,000,000.0        
Debt instrument, basis spread on variable rate           2.25%      
Number of credit facilities | creditFacility         2        
Subordinated Credit Facility | Subordinated Debt | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)                  
Debt Instrument, Redemption [Line Items]                  
Debt instrument, basis spread on variable rate, per annum adjustment           0.10%      
Subordinated Credit Facility One | Subordinated Debt | Revolving Credit Facility                  
Debt Instrument, Redemption [Line Items]                  
Borrowing Capacity         $ 15,000,000.0        
Subordinated Credit Facility Two | Subordinated Debt | Revolving Credit Facility                  
Debt Instrument, Redemption [Line Items]                  
Borrowing Capacity         $ 15,000,000.0