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Investment Securities - Fair Value Measurement by Level (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Mar. 28, 2024
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value $ 561.5   $ 538.4
Other long-term investments 1,991.9   1,998.2
U.S. Government and agency obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 245.9   204.9
Debt securities issued by corporations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 1,073.1   1,045.0
Municipal obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 239.0   260.9
Mortgage and asset-backed securities      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 450.1   389.4
Collateralized loan obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 246.5   209.1
Fixed maturity investments      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 2,254.6   2,109.3
Level 2 | Mortgage and asset-backed securities      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 450.1   389.4
Level 2 | Collateralized loan obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 246.5   209.1
Level 3 | Mortgage and asset-backed securities      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 0.0   0.0
Level 3 | Collateralized loan obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 0.0   0.0
Fair value measured on a recurring basis      
Debt and Equity Securities, FV-NI [Line Items]      
Fair value investments 6,328.1   6,388.7
Fair value measured on a recurring basis | MediaAlpha      
Debt and Equity Securities, FV-NI [Line Items]      
Other long-term investments 465.6 $ 465.6 254.9
Fair value measured on a recurring basis | U.S. Government and agency obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 245.9   204.9
Fair value measured on a recurring basis | Debt securities issued by corporations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 1,073.1   1,045.0
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 323.7   309.8
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 219.3   214.6
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 128.2   121.6
Fair value measured on a recurring basis | Debt securities issued by corporations | Healthcare      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 121.9   121.3
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 101.6   108.9
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 68.8   70.2
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 41.3   46.3
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 37.5   28.9
Fair value measured on a recurring basis | Debt securities issued by corporations | Materials      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 30.8   23.4
Fair value measured on a recurring basis | Municipal obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 239.0   260.9
Fair value measured on a recurring basis | Mortgage and asset-backed securities      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 450.1   389.4
Fair value measured on a recurring basis | Collateralized loan obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 246.5   209.1
Fair value measured on a recurring basis | Fixed maturity investments      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 2,254.6   2,109.3
Fair value measured on a recurring basis | Short-term investments      
Debt and Equity Securities, FV-NI [Line Items]      
Short-term investments, at fair value 1,054.5   1,487.9
Fair value measured on a recurring basis | Exchange-traded funds      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value 151.6   137.8
Fair value measured on a recurring basis | Common stock, other      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value 409.9   400.6
Fair value measured on a recurring basis | Common equity securities      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value 561.5   538.4
Fair value measured on a recurring basis | Other Long-Term Investments      
Debt and Equity Securities, FV-NI [Line Items]      
Other long-term investments 1,991.9   1,998.2
Fair value measured on a recurring basis | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Other long-term investments      
Debt and Equity Securities, FV-NI [Line Items]      
Other long-term investments 1,155.9   1,164.4
Fair value measured on a recurring basis | Level 1      
Debt and Equity Securities, FV-NI [Line Items]      
Fair value investments 1,893.4   2,055.2
Fair value measured on a recurring basis | Level 1 | MediaAlpha      
Debt and Equity Securities, FV-NI [Line Items]      
Other long-term investments 465.6   254.9
Fair value measured on a recurring basis | Level 1 | U.S. Government and agency obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 245.1   204.9
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 0.0   0.0
Fair value measured on a recurring basis | Level 1 | Municipal obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 0.0   0.0
Fair value measured on a recurring basis | Level 1 | Collateralized loan obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 0.0   0.0
Fair value measured on a recurring basis | Level 1 | Fixed maturity investments      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 245.1   204.9
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 1,031.1   1,457.6
Fair value measured on a recurring basis | Level 1 | Exchange-traded funds      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value 151.6   137.8
Fair value measured on a recurring basis | Level 1 | Common stock, other      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value 0.0   0.0
Fair value measured on a recurring basis | Level 1 | Common equity securities      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value 151.6   137.8
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      
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 2,469.9   2,361.5
Fair value measured on a recurring basis | Level 2 | 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]      
Fixed maturity investments, at fair value 0.8   0.0
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 1,073.1   1,045.0
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Financials      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 323.7   309.8
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Consumer      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 219.3   214.6
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Industrial      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 128.2   121.6
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Healthcare      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 121.9   121.3
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Technology      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 101.6   108.9
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Utilities      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 68.8   70.2
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Communications      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 41.3   46.3
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Energy      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 37.5   28.9
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Materials      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 30.8   23.4
Fair value measured on a recurring basis | Level 2 | Municipal obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 239.0   260.9
Fair value measured on a recurring basis | Level 2 | Mortgage and asset-backed securities      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 450.1   389.4
Fair value measured on a recurring basis | Level 2 | Collateralized loan obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 246.5   209.1
Fair value measured on a recurring basis | Level 2 | Fixed maturity investments      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 2,009.5   1,904.4
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 23.4   30.3
Fair value measured on a recurring basis | Level 2 | Exchange-traded funds      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value 0.0   0.0
Fair value measured on a recurring basis | Level 2 | Common stock, other      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value 409.9   400.6
Fair value measured on a recurring basis | Level 2 | Common equity securities      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value 409.9   400.6
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 27.1   26.2
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 27.1   26.2
Fair value measured on a recurring basis | Level 3      
Debt and Equity Securities, FV-NI [Line Items]      
Fair value investments 1,128.8   1,138.2
Fair value measured on a recurring basis | Level 3 | 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 0.0   0.0
Fair value measured on a recurring basis | Level 3 | Municipal obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 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]      
Fixed maturity investments, at fair value 0.0   0.0
Fair value measured on a recurring basis | Level 3 | Collateralized loan obligations      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 0.0   0.0
Fair value measured on a recurring basis | Level 3 | Fixed maturity investments      
Debt and Equity Securities, FV-NI [Line Items]      
Fixed maturity investments, at fair value 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 | Exchange-traded funds      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, at fair value 0.0   0.0
Fair value measured on a recurring basis | Level 3 | Common stock, other      
Debt and Equity Securities, FV-NI [Line Items]      
Common equity securities, 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]      
Common equity securities, at fair value 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 1,128.8   1,138.2
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 1,128.8   1,138.2
Fair value measured on a recurring basis | NAV | Other long-term investments      
Debt and Equity Securities, FV-NI [Line Items]      
Other long-term investments $ 836.0   $ 833.8