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Debt - Additional Information (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
d
$ / shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2024
USD ($)
Debt Instrument [Line Items]          
Repayments of long-term debt   $ 750,000,000.0 $ 25,000,000.0 $ 60,800,000  
Debt   2,620,200,000 2,537,500,000    
Senior bank debt          
Debt Instrument [Line Items]          
Debt   0 349,900,000    
Senior bank debt | Term Loan          
Debt Instrument [Line Items]          
Repayments of long-term debt   $ 350,000,000.0      
Basis spread over variable debt rate   0.10%      
Outstanding borrowings     $ 350,000,000.0    
Weighted average interest rate on amount outstanding     6.31%    
Senior bank debt | Term Loan | Debt Instrument, Adjustment Rate          
Debt Instrument [Line Items]          
Basis spread over variable debt rate   0.10%      
Senior bank debt | Term Loan | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Basis spread over variable debt rate   0.85%      
Senior bank debt | Revolver          
Debt Instrument [Line Items]          
Available borrowing   $ 1,250,000,000      
Additional borrowing amount   500,000,000.0      
Outstanding borrowings   0 $ 0    
Commitment fee amount   1,300,000 1,300,000    
Senior notes          
Debt Instrument [Line Items]          
Debt   $ 1,092,100,000 1,096,900,000    
Senior notes | 2024 Senior Notes          
Debt Instrument [Line Items]          
Repayments of long-term debt $ 400,000,000        
Stated interest rate 4.25%        
Senior notes | 2034 Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate   5.50%      
Par value   $ 400,000,000.0     $ 400,000,000.0
Redemption price percentage   100.00%      
Senior notes | 2025 Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate   3.50%      
Par value   $ 350,000,000.0      
Redemption price percentage   100.00%      
Applicable basis spread over redemption price percentage   0.25%      
Senior notes | 2030 Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate   3.30%      
Par value   $ 350,000,000.0      
Redemption price percentage   100.00%      
Applicable basis spread over redemption price percentage   0.40%      
Junior subordinated notes          
Debt Instrument [Line Items]          
Debt   $ 1,189,000,000 751,800,000    
Junior subordinated notes | On or after March 30, 2029          
Debt Instrument [Line Items]          
Redemption price percentage   100.00%      
Junior subordinated notes | If changes in tax laws and interpretations occur          
Debt Instrument [Line Items]          
Redemption price percentage   100.00%      
Junior subordinated notes | If a rating agency makes certain changes relating to the equity credit criteria for securities          
Debt Instrument [Line Items]          
Redemption price percentage   102.00%      
Junior subordinated notes | 6.750% Junior Subordinated Notes due 2064          
Debt Instrument [Line Items]          
Stated interest rate   6.75%      
Par value $ 450,000,000 $ 450,000,000.0      
Junior subordinated notes | 6.750% Junior Subordinated Notes due 2064 | On or after March 30, 2029          
Debt Instrument [Line Items]          
Redemption price percentage 100.00%        
Junior convertible securities          
Debt Instrument [Line Items]          
Debt   339,100,000 338,900,000    
Junior convertible securities | Junior Convertible Trust Preferred Securities          
Debt Instrument [Line Items]          
Debt   $ 341,700,000      
Stated interest rate   5.15%      
Unamortized debt issuance expense   $ 2,700,000 $ 2,900,000    
Conversion ratio (in shares)   0.2558      
Face amount of convertible security (in dollars per share) | $ / shares   $ 50.00      
Conversion price (in dollars per share) | $ / shares   $ 195.47      
Number of trading days closing price has exceeded threshold | d   20      
Number of consecutive trading days | d   30      
Debt instrument, convertible, threshold percentage   1.30      
Deferred tax liability   $ 10,000,000