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Fair Value Measurements - Additional Information - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
quotesPerInvestment
Dec. 31, 2023
USD ($)
quotesPerInvestment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Quotes per fixed income investment | quotesPerInvestment 3.0 2.9
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Privately-held Investments, at fair value $ 286.8  
Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Privately-held Investments, at fair value 286.8  
Total, Privately-held Investments 311.0  
Assets | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers out of Level 3 0.0 $ 12.1
Transfers Into Level 3 0.0 5.3
Settlements and sales $ (239.7) (137.2)
Equity Securities | Assets | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Transfers out of Level 3   (6.6)
Transfers Into Level 3   0.0
Settlements and sales   $ 0.0