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Fair Value of Financial Instruments - Fixed-Rate Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
2025 Senior Unsecured Notes    
Debt Instrument [Line Items]    
Carrying value $ 0.0 $ 400.0
2025 Senior Unsecured Notes | Level 3    
Debt Instrument [Line Items]    
Fair value 0.0 382.0
2027 Senior Unsecured Notes    
Debt Instrument [Line Items]    
Carrying value 600.0 600.0
2027 Senior Unsecured Notes | Level 3    
Debt Instrument [Line Items]    
Fair value 558.7 554.6
2029 Senior Unsecured Notes    
Debt Instrument [Line Items]    
Carrying value 400.0 0.0
2029 Senior Unsecured Notes | Level 3    
Debt Instrument [Line Items]    
Fair value 399.0 0.0
2032 Senior Unsecured Notes    
Debt Instrument [Line Items]    
Carrying value 400.0 0.0
2032 Senior Unsecured Notes | Level 3    
Debt Instrument [Line Items]    
Fair value $ 397.2 $ 0.0