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Investment Securities (Fair Value Measurement by Level) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Investment
Dec. 31, 2017
USD ($)
Investment
Dec. 31, 2016
USD ($)
Investment securities      
Percentage of investments recorded at fair value 87.00% 94.00%  
Fair value investments $ 2,328.7 $ 3,208.3 $ 2,547.3
U.S. Government and agency obligations      
Investment securities      
Cost or amortized cost 154.0 297.8  
Debt securities issued by corporations      
Investment securities      
Cost or amortized cost 519.0 867.6  
Fair value investments 510.5 880.9  
Mortgage and asset-backed securities      
Investment securities      
Cost or amortized cost 136.1 697.2  
Fair value investments 133.5 694.7  
Municipal obligations      
Investment securities      
Cost or amortized cost $ 279.0 252.0  
Foreign government, agency and provincial obligations      
Investment securities      
Cost or amortized cost   $ 2.6  
Common Stock      
Investment securities      
Number of investments | Investment 2 2  
Cost or amortized cost $ 904.7 $ 739.7  
Level 1      
Investment securities      
Fair value investments 842.6 890.4 279.5
Level 2      
Investment securities      
Fair value investments 1,160.5 2,105.4 2,093.8
Level 2 | Mortgage and asset-backed securities      
Investment securities      
Fair value investments 133.5 694.7  
Level 3 Inputs | Mortgage and asset-backed securities      
Investment securities      
Fair value investments 0.0 $ 0.0  
Level 3 Inputs | Fixed maturity investments      
Investment securities      
Number of investments | Investment   3  
Fair value investments   $ 0.0 0.0
Level 3 Inputs | Other long-term investments      
Investment securities      
Fair value investments 138.7 77.2 91.4
Level 3 Inputs | Hedge Funds and Private Equity Funds      
Investment securities      
Fair value investments     $ 82.6
Fair Value Measured at Net Asset Value Per Share | Hedge Funds and Private Equity Funds      
Investment securities      
Fair value investments 186.9 135.3  
Fair value measured on a recurring basis      
Investment securities      
Fair value investments 2,542.9 3,384.4  
Fair value measured on a recurring basis | U.S. Government and agency obligations      
Investment securities      
Fair value investments 153.2 296.5  
Fair value measured on a recurring basis | Debt securities issued by corporations      
Investment securities      
Fair value investments 510.5 880.9  
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer      
Investment securities      
Fair value investments 68.5 185.1  
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications      
Investment securities      
Fair value investments 31.8 127.8  
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials      
Investment securities      
Fair value investments 143.4 114.8  
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities      
Investment securities      
Fair value investments 19.8 108.9  
Fair value measured on a recurring basis | Debt securities issued by corporations | Materials      
Investment securities      
Fair value investments 26.3 95.5  
Fair value measured on a recurring basis | Debt securities issued by corporations | Healthcare      
Investment securities      
Fair value investments 55.0 94.3  
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology      
Investment securities      
Fair value investments 60.5 80.5  
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy      
Investment securities      
Fair value investments 57.6 48.1  
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial      
Investment securities      
Fair value investments 47.6 25.9  
Fair value measured on a recurring basis | Mortgage and asset-backed securities      
Investment securities      
Fair value investments 133.5 694.7  
Fair value measured on a recurring basis | Municipal obligations      
Investment securities      
Fair value investments 280.3 254.9  
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations      
Investment securities      
Fair value investments   2.7  
Fair value measured on a recurring basis | Fixed maturity investments      
Investment securities      
Fair value investments 1,077.5 2,129.7  
Fair value measured on a recurring basis | Common equity securities | Consumer      
Investment securities      
Fair value investments 6.2 10.7  
Fair value measured on a recurring basis | Common equity securities | Communications      
Investment securities      
Fair value investments 12.7 10.9  
Fair value measured on a recurring basis | Common equity securities | Financials      
Investment securities      
Fair value investments 13.5 16.3  
Fair value measured on a recurring basis | Common equity securities | Materials      
Investment securities      
Fair value investments 3.1    
Fair value measured on a recurring basis | Common equity securities | Healthcare      
Investment securities      
Fair value investments 14.0 17.1  
Fair value measured on a recurring basis | Common equity securities | Technology      
Investment securities      
Fair value investments 7.4 15.1  
Fair value measured on a recurring basis | Common equity securities | Energy      
Investment securities      
Fair value investments 4.1 3.8  
Fair value measured on a recurring basis | Common equity securities | Industrial      
Investment securities      
Fair value investments 11.4 11.9  
Fair value measured on a recurring basis | Common equity securities | Other      
Investment securities      
Fair value investments 177.9 210.6  
Fair value measured on a recurring basis | Common equity securities | Exchange traded funds      
Investment securities      
Fair value investments 675.3 569.7  
Fair value measured on a recurring basis | Common equity securities | Common equity securities      
Investment securities      
Fair value investments 925.6 866.1  
Fair value measured on a recurring basis | Other long-term investments      
Investment securities      
Fair value investments 138.7 77.2  
Fair value measured on a recurring basis | Level 1      
Investment securities      
Fair value investments 1,047.0 1,041.4  
Fair value measured on a recurring basis | Level 1 | U.S. Government and agency obligations      
Investment securities      
Fair value investments 153.2 296.5  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Consumer      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Communications      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Financials      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Utilities      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Materials      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Healthcare      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Technology      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Energy      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Industrial      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Mortgage and asset-backed securities      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Municipal obligations      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Foreign government, agency and provincial obligations      
Investment securities      
Fair value investments   0.0  
Fair value measured on a recurring basis | Level 1 | Fixed maturity investments      
Investment securities      
Fair value investments 153.2 296.5  
Fair value measured on a recurring basis | Level 1 | Short-term investments      
Investment securities      
Fair value investments 204.4 151.0  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Consumer      
Investment securities      
Fair value investments 6.2 10.7  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Communications      
Investment securities      
Fair value investments 12.7 10.9  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Financials      
Investment securities      
Fair value investments 13.5 16.3  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Materials      
Investment securities      
Fair value investments 3.1    
Fair value measured on a recurring basis | Level 1 | Common equity securities | Healthcare      
Investment securities      
Fair value investments 14.0 17.1  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Technology      
Investment securities      
Fair value investments 7.4 15.1  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Energy      
Investment securities      
Fair value investments 4.1 3.8  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Industrial      
Investment securities      
Fair value investments 11.4 11.9  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Other      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Exchange traded funds      
Investment securities      
Fair value investments 617.0 508.1  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Common equity securities      
Investment securities      
Fair value investments 689.4 593.9  
Fair value measured on a recurring basis | Level 1 | Other long-term investments      
Investment securities      
Fair value investments 0.0 3,208.3  
Fair value measured on a recurring basis | Level 2      
Investment securities      
Fair value investments 1,170.3 2,130.5  
Fair value measured on a recurring basis | Level 2 | U.S. Government and agency obligations      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations      
Investment securities      
Fair value investments 510.5 880.9  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Consumer      
Investment securities      
Fair value investments 68.5 185.1  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Communications      
Investment securities      
Fair value investments 31.8 127.8  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Financials      
Investment securities      
Fair value investments 143.4 114.8  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Utilities      
Investment securities      
Fair value investments 19.8 108.9  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Materials      
Investment securities      
Fair value investments 26.3 95.5  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Healthcare      
Investment securities      
Fair value investments 55.0 94.3  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Technology      
Investment securities      
Fair value investments 60.5 80.5  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Energy      
Investment securities      
Fair value investments 57.6 48.1  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Industrial      
Investment securities      
Fair value investments 47.6 25.9  
Fair value measured on a recurring basis | Level 2 | Mortgage and asset-backed securities      
Investment securities      
Fair value investments 133.5 694.7  
Fair value measured on a recurring basis | Level 2 | Municipal obligations      
Investment securities      
Fair value investments 280.3 254.9  
Fair value measured on a recurring basis | Level 2 | Foreign government, agency and provincial obligations      
Investment securities      
Fair value investments   2.7  
Fair value measured on a recurring basis | Level 2 | Fixed maturity investments      
Investment securities      
Fair value investments 924.3 1,833.2  
Fair value measured on a recurring basis | Level 2 | Short-term investments      
Investment securities      
Fair value investments 9.8 25.1  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Consumer      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Communications      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Financials      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Materials      
Investment securities      
Fair value investments 0.0    
Fair value measured on a recurring basis | Level 2 | Common equity securities | Healthcare      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Technology      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Energy      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Industrial      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Other      
Investment securities      
Fair value investments 177.9 210.6  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Exchange traded funds      
Investment securities      
Fair value investments 58.3 61.6  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Common equity securities      
Investment securities      
Fair value investments 236.2 272.2  
Fair value measured on a recurring basis | Level 2 | Other long-term investments      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs      
Investment securities      
Fair value investments 138.7 77.2  
Fair value measured on a recurring basis | Level 3 Inputs | U.S. Government and agency obligations      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations | Consumer      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations | Communications      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations | Financials      
Investment securities      
Fair value investments   0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations | Utilities      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations | Materials      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations | Healthcare      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations | Technology      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations | Energy      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations | Industrial      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Mortgage and asset-backed securities      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Municipal obligations      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Foreign government, agency and provincial obligations      
Investment securities      
Fair value investments   0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Fixed maturity investments      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Short-term investments      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Consumer      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Communications      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Financials      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Materials      
Investment securities      
Fair value investments 0.0    
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Healthcare      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Technology      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Energy      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Industrial      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Other      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Exchange traded funds      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Common equity securities      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Other long-term investments      
Investment securities      
Fair value investments $ 138.7 77.2  
Fair value measured on a recurring basis | Fair Value Measured at Net Asset Value Per Share | Other long-term investments      
Investment securities      
Fair value investments   135.3  
Foreign Exchange Forward | Fair value measured on a recurring basis | Level 3 Inputs | Other long-term investments      
Investment securities      
Derivative, fair value, net   $ (3.7)