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Investment Securities (Fair Value Measurement by Level) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investment securities      
Percentage of investments recorded at fair value 91.00% 88.00%  
Fair value investments $ 4,050.9 $ 3,343.6 $ 3,889.0
Fair value, investment-related liabilities   31.6  
Debt securities issued by corporations      
Investment securities      
Fair value investments 1,000.0 1,171.7  
Mortgage-backed and asset-backed securities      
Investment securities      
Fair value investments 1,167.0 967.9  
Discontinued Operations      
Investment securities      
Investments reclassified to assets held for sale     236.3
Level 1      
Investment securities      
Fair value investments 1,152.2 550.6 997.2
Level 2      
Investment securities      
Fair value investments 2,531.4 2,372.9 2,575.4
Level 2 | Mortgage-backed and asset-backed securities      
Investment securities      
Fair value investments 1,167.0 967.9  
Level 3 Inputs | Mortgage-backed and asset-backed securities      
Investment securities      
Fair value investments 0.0 0.0  
Level 3 Inputs | Fixed maturity investments      
Investment securities      
Fair value investments 70.0 76.4 81.8
Level 3 Inputs | Common equity securities      
Investment securities      
Fair value investments 0.0 39.5 45.4
Level 3 Inputs | Other long-term investments      
Investment securities      
Fair value investments 297.3 304.2 189.2
Fair value measured on a recurring basis      
Investment securities      
Fair value investments 4,262.2 3,720.4  
Fair value measured on a recurring basis | US Government and agency obligations      
Investment securities      
Fair value investments 160.0 105.2  
Fair value measured on a recurring basis | Debt securities issued by corporations      
Investment securities      
Fair value investments 1,000.0 1,171.7  
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials      
Investment securities      
Fair value investments 175.9 254.7  
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer      
Investment securities      
Fair value investments 253.3 259.2  
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial      
Investment securities      
Fair value investments 135.6 107.3  
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications      
Investment securities      
Fair value investments 49.2 71.5  
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy      
Investment securities      
Fair value investments 61.5 84.1  
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities      
Investment securities      
Fair value investments 82.0 65.6  
Fair value measured on a recurring basis | Debt securities issued by corporations | Materials      
Investment securities      
Fair value investments 31.2 51.7  
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology      
Investment securities      
Fair value investments 60.0 88.3  
Fair value measured on a recurring basis | Debt securities issued by corporations | Other      
Investment securities      
Fair value investments 0.0 7.5  
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities      
Investment securities      
Fair value investments 1,167.0 967.9  
Fair value measured on a recurring basis | Preferred stocks      
Investment securities      
Fair value investments 82.7 84.2  
Fair value measured on a recurring basis | Municipal obligations      
Investment securities      
Fair value investments 228.8 82.2  
Fair value measured on a recurring basis | Foreign government, agency and provincial obligations      
Investment securities      
Fair value investments 1.2 10.8  
Fair value measured on a recurring basis | Fixed maturity investments      
Investment securities      
Fair value investments 2,639.7 2,422.0  
Fair value measured on a recurring basis | Short-term investments      
Investment securities      
Fair value investments 211.3 376.8 310.4
Fair value measured on a recurring basis | Common equity securities | Financials      
Investment securities      
Fair value investments 694.7 180.7  
Fair value measured on a recurring basis | Common equity securities | Consumer      
Investment securities      
Fair value investments 70.0 116.0  
Fair value measured on a recurring basis | Common equity securities | Industrial      
Investment securities      
Fair value investments 26.6 57.1  
Fair value measured on a recurring basis | Common equity securities | Communications      
Investment securities      
Fair value investments 43.7 28.5  
Fair value measured on a recurring basis | Common equity securities | Energy      
Investment securities      
Fair value investments   4.9  
Fair value measured on a recurring basis | Common equity securities | Utilities      
Investment securities      
Fair value investments   18.1  
Fair value measured on a recurring basis | Common equity securities | Materials      
Investment securities      
Fair value investments   12.0  
Fair value measured on a recurring basis | Common equity securities | Technology      
Investment securities      
Fair value investments 27.0 44.8  
Fair value measured on a recurring basis | Common equity securities | Other      
Investment securities      
Fair value investments 74.4 75.2  
Fair value measured on a recurring basis | Common equity securities | Exchange Traded Funds [Member]      
Investment securities      
Fair value investments 141.8    
Fair value measured on a recurring basis | Common equity securities | Common equity securities      
Investment securities      
Fair value investments 1,113.9 611.7  
Fair value measured on a recurring basis | Other long-term investments      
Investment securities      
Fair value investments 297.3 309.9  
Fair value measured on a recurring basis | Level 1      
Investment securities      
Fair value investments 1,363.5 926.9  
Fair value measured on a recurring basis | Level 1 | US Government and agency obligations      
Investment securities      
Fair value investments 133.4 51.2  
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 | Financials      
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 | Industrial      
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 | Energy      
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 | Technology      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Debt securities issued by corporations | Other      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Mortgage-backed and asset-backed securities      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 1 | Preferred stocks      
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 0.6 0.6  
Fair value measured on a recurring basis | Level 1 | Fixed maturity investments      
Investment securities      
Fair value investments 134.0 51.8  
Fair value measured on a recurring basis | Level 1 | Short-term investments      
Investment securities      
Fair value investments 211.3 376.3  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Financials      
Investment securities      
Fair value investments 694.7 141.2  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Consumer      
Investment securities      
Fair value investments 70.0 115.9  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Industrial      
Investment securities      
Fair value investments 26.6 57.1  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Communications      
Investment securities      
Fair value investments 43.7 28.5  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Energy      
Investment securities      
Fair value investments   4.9  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Utilities      
Investment securities      
Fair value investments   18.1  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Materials      
Investment securities      
Fair value investments   12.0  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Technology      
Investment securities      
Fair value investments 27.0 44.8  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Other      
Investment securities      
Fair value investments 0.0 1.9  
Fair value measured on a recurring basis | Level 1 | Common equity securities | Exchange Traded Funds [Member]      
Investment securities      
Fair value investments 120.5    
Fair value measured on a recurring basis | Level 1 | Common equity securities | Common equity securities      
Investment securities      
Fair value investments 1,018.2 498.8  
Fair value measured on a recurring basis | Level 1 | Other long-term investments      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 2      
Investment securities      
Fair value investments 2,531.4 2,373.4  
Fair value measured on a recurring basis | Level 2 | US Government and agency obligations      
Investment securities      
Fair value investments 26.6 54.0  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations      
Investment securities      
Fair value investments 1,000.0 1,166.4  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Financials      
Investment securities      
Fair value investments 175.9 254.7  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Consumer      
Investment securities      
Fair value investments 253.3 259.2  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Industrial      
Investment securities      
Fair value investments 135.6 102.0  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Communications      
Investment securities      
Fair value investments 49.2 71.5  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Energy      
Investment securities      
Fair value investments 61.5 84.1  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Utilities      
Investment securities      
Fair value investments 82.0 65.6  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Materials      
Investment securities      
Fair value investments 31.2 51.7  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Technology      
Investment securities      
Fair value investments 60.0 88.3  
Fair value measured on a recurring basis | Level 2 | Debt securities issued by corporations | Other      
Investment securities      
Fair value investments 0.0 7.5  
Fair value measured on a recurring basis | Level 2 | Mortgage-backed and asset-backed securities      
Investment securities      
Fair value investments 1,167.0 967.9  
Fair value measured on a recurring basis | Level 2 | Preferred stocks      
Investment securities      
Fair value investments 12.7 13.1  
Fair value measured on a recurring basis | Level 2 | Municipal obligations      
Investment securities      
Fair value investments 228.8 82.2  
Fair value measured on a recurring basis | Level 2 | Foreign government, agency and provincial obligations      
Investment securities      
Fair value investments 0.6 10.2  
Fair value measured on a recurring basis | Level 2 | Fixed maturity investments      
Investment securities      
Fair value investments 2,435.7 2,293.8  
Fair value measured on a recurring basis | Level 2 | Short-term investments      
Investment securities      
Fair value investments 0.0 0.5  
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 | Consumer      
Investment securities      
Fair value investments 0.0 0.1  
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 | Communications      
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  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Utilities      
Investment securities      
Fair value investments   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 | Technology      
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 74.4 73.3  
Fair value measured on a recurring basis | Level 2 | Common equity securities | Exchange Traded Funds [Member]      
Investment securities      
Fair value investments 21.3    
Fair value measured on a recurring basis | Level 2 | Common equity securities | Common equity securities      
Investment securities      
Fair value investments 95.7 73.4  
Fair value measured on a recurring basis | Level 2 | Other long-term investments      
Investment securities      
Fair value investments 0.0 5.7  
Fair value measured on a recurring basis | Level 3 Inputs      
Investment securities      
Fair value investments 367.3 420.1  
Fair value measured on a recurring basis | Level 3 Inputs | US 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 5.3  
Fair value measured on a recurring basis | Level 3 Inputs | Debt securities issued by corporations | Financials      
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 | Industrial      
Investment securities      
Fair value investments 0.0 5.3  
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 | 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 | 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 | 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 | Other      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Mortgage-backed and asset-backed securities      
Investment securities      
Fair value investments 0.0 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Preferred stocks      
Investment securities      
Fair value investments 70.0 71.1  
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 0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Fixed maturity investments      
Investment securities      
Fair value investments 70.0 76.4  
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 | Financials      
Investment securities      
Fair value investments 0.0 39.5  
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 | Industrial      
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 | Energy      
Investment securities      
Fair value investments   0.0  
Fair value measured on a recurring basis | Level 3 Inputs | Common equity securities | Utilities      
Investment securities      
Fair value investments   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 | Technology      
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 [Member]      
Investment securities      
Fair value investments 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 39.5  
Fair value measured on a recurring basis | Level 3 Inputs | Other long-term investments      
Investment securities      
Fair value investments 297.3 304.2  
Carrying value of investment accounted for using the equity method 3.8 5.2 $ 6.8
Affordable Housing Development Fund [Member] | Other long-term investments      
Investment securities      
Fair value investments $ 14.7 $ 16.8