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Investment Securities - Fair Value Measurement by Level (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments $ 1,468.7 $ 1,377.8    
Debt securities issued by corporations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 974.2 992.9    
Mortgage and asset-backed securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 244.6 277.6    
Collateralized loan obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 141.8 135.0    
Level 2 | Mortgage and asset-backed securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 244.6 277.6    
Level 2 | Collateralized loan obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 141.8 135.0    
Level 3 | Mortgage and asset-backed securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Level 3 | Collateralized loan obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Level 3 | Other long-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 933.3 890.6 $ 674.4 $ 614.2
Fair value measured on a recurring basis        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 4,026.0 4,265.3    
Other long-term investments 1,468.7 1,377.8    
Fair value measured on a recurring basis | Marketing Technology (MediaAlpha)        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 166.9 261.6    
Fair value measured on a recurring basis | U.S. Government and agency obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 225.8 211.5    
Fair value measured on a recurring basis | Debt securities issued by corporations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 974.2 992.9    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 263.5 264.2    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 176.8 178.1    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 117.9 117.9    
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 112.7 112.9    
Fair value measured on a recurring basis | Debt securities issued by corporations | Healthcare        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 105.9 112.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 75.1 70.9    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 57.8 56.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 40.3 48.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Materials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 24.2 32.1    
Fair value measured on a recurring basis | Municipal obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 280.3 291.9    
Fair value measured on a recurring basis | Mortgage and asset-backed securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 244.6 277.6    
Fair value measured on a recurring basis | Collateralized loan obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 141.8 135.0    
Fair value measured on a recurring basis | Fixed maturity investments        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 1,866.7 1,908.9    
Fair value measured on a recurring basis | Short-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Short-term investments, at fair value 245.1 465.9    
Fair value measured on a recurring basis | Common equity securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 278.6 251.1    
Fair value measured on a recurring basis | Other long-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 947.1 895.3    
Fair value measured on a recurring basis | Other long-term investments — NAV        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 521.6 482.5    
Fair value measured on a recurring basis | Level 1        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 637.8 939.0    
Other long-term investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Marketing Technology (MediaAlpha)        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 166.9 261.6    
Fair value measured on a recurring basis | Level 1 | U.S. Government and agency obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 225.8 211.5    
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Financials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Consumer        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Technology        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Industrial        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Healthcare        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Utilities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Communications        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Energy        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Materials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Municipal obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Mortgage and asset-backed securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Collateralized loan obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Fixed maturity investments        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 225.8 211.5    
Fair value measured on a recurring basis | Level 1 | Short-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Short-term investments, at fair value 245.1 465.9    
Fair value measured on a recurring basis | Level 1 | Common equity securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Other long-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 0.0 0.0    
Fair value measured on a recurring basis | Level 1 | Other long-term investments — NAV        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 0.0 0.0    
Fair value measured on a recurring basis | Level 2        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 1,933.3 1,953.2    
Other long-term investments 13.8 4.7    
Fair value measured on a recurring basis | Level 2 | Marketing Technology (MediaAlpha)        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 0.0 0.0    
Fair value measured on a recurring basis | Level 2 | U.S. Government and agency obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 974.2 992.9    
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Financials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 263.5 264.2    
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Consumer        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 176.8 178.1    
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Technology        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 117.9 117.9    
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Industrial        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 112.7 112.9    
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Healthcare        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 105.9 112.8    
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Utilities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 75.1 70.9    
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Communications        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 57.8 56.0    
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Energy        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 40.3 48.0    
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Materials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 24.2 32.1    
Fair value measured on a recurring basis | Level 2 | Municipal obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 280.3 291.9    
Fair value measured on a recurring basis | Level 2 | Mortgage and asset-backed securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 244.6 277.6    
Fair value measured on a recurring basis | Level 2 | Collateralized loan obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 141.8 135.0    
Fair value measured on a recurring basis | Level 2 | Fixed maturity investments        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 1,640.9 1,697.4    
Fair value measured on a recurring basis | Level 2 | Short-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Short-term investments, at fair value 0.0 0.0    
Fair value measured on a recurring basis | Level 2 | Common equity securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 278.6 251.1    
Fair value measured on a recurring basis | Level 2 | Other long-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 13.8 4.7    
Fair value measured on a recurring basis | Level 2 | Other long-term investments — NAV        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 933.3 890.6    
Other long-term investments 933.3 890.6    
Fair value measured on a recurring basis | Level 3 | Marketing Technology (MediaAlpha)        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | U.S. Government and agency obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Debt securities issued by corporations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Debt securities issued by corporations | Financials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Debt securities issued by corporations | Consumer        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Debt securities issued by corporations | Technology        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Debt securities issued by corporations | Industrial        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Debt securities issued by corporations | Healthcare        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Debt securities issued by corporations | Utilities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Debt securities issued by corporations | Communications        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Debt securities issued by corporations | Energy        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Debt securities issued by corporations | Materials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Municipal obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Mortgage and asset-backed securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Collateralized loan obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Fixed maturity investments        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Short-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Short-term investments, at fair value 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Common equity securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Level 3 | Other long-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments 933.3 890.6    
Fair value measured on a recurring basis | Level 3 | Other long-term investments — NAV        
Debt and Equity Securities, FV-NI [Line Items]        
Other long-term investments $ 0.0 $ 0.0