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Debt Obligations - Schedule of Long-term Debt Instruments (Details)
1 Months Ended 3 Months Ended
Mar. 04, 2024
USD ($)
Apr. 14, 2023
USD ($)
Apr. 30, 2025
USD ($)
Aug. 31, 2014
USD ($)
creditFacility
Mar. 31, 2025
USD ($)
tranche
May 07, 2025
USD ($)
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         $ 2,630,000,000      
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         $ 1,483,287,000   $ 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         $ 1,200,000,000      
Carrying Value         $ 180,000,000   $ 0  
Interest Rate         5.42%   5.43%  
Senior Unsecured Revolving Credit Facility | Line of Credit | Revolving Credit Facility                
Debt Instrument, Redemption [Line Items]                
Borrowing Capacity         $ 1,200,000,000      
Senior Unsecured Revolving Credit Facility | Line of Credit | Revolving Credit Facility | Subsequent Event                
Debt Instrument, Redemption [Line Items]                
Borrowing Capacity           $ 1,650,000,000    
Proceeds from issuance of long-term debt     $ 150,000,000          
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         $ 594,214,000   $ 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         $ 390,121,000   $ 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         $ 196,745,000   $ 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         $ 49,207,000   $ 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     $ 150,000,000      
Carrying Value         $ 73,000,000   $ 52,000,000  
Interest Rate         6.32%   6.33%  
Debt instrument, term   364 days            
364-Day Revolving Credit Facility | Line of Credit | Subsequent Event                
Debt Instrument, Redemption [Line Items]                
Borrowing Capacity     $ 300,000,000          
Debt instrument, term     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