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Investment Securities (Fair Value Measurement by Level) (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Investment
Dec. 31, 2018
USD ($)
Investment
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments $ 2,483.0 $ 2,328.7 $ 2,275.4 $ 3,208.3
Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 684.5 842.6 765.3 890.4
Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments $ 1,134.1 $ 1,160.5 1,254.6 2,105.4
Common Stock        
Debt and Equity Securities, FV-NI [Line Items]        
Number of hedge funds | Investment 2 2    
Debt securities issued by corporations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments $ 457.8 $ 510.5    
Mortgage-backed and asset-backed securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 169.4 133.5    
Mortgage-backed and asset-backed securities | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 169.4 133.5    
Mortgage-backed and asset-backed securities | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Other long-term investments | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 458.0 138.7 114.9 77.2
Hedge and private equity funds included in other long-term investments | NAV        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 206.4 186.9 140.6 135.3
Fair value measured on a recurring basis        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 2,670.1 2,542.9    
Fair value measured on a recurring basis | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 854.3 1,047.0    
Fair value measured on a recurring basis | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 1,151.4 1,170.3    
Fair value measured on a recurring basis | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 458.0 138.7    
Fair value measured on a recurring basis | U.S. Government and agency obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 184.8 153.2    
Fair value measured on a recurring basis | U.S. Government and agency obligations | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 184.8 153.2    
Fair value measured on a recurring basis | U.S. Government and agency obligations | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | U.S. Government and agency obligations | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 457.8 510.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 457.8 510.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 134.3 143.4    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 134.3 143.4    
Fair value measured on a recurring basis | Debt securities issued by corporations | Financials | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Health Care        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 60.9 55.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Health Care | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Health Care | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 60.9 55.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Health Care | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 55.5 47.6    
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 55.5 47.6    
Fair value measured on a recurring basis | Debt securities issued by corporations | Industrial | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 48.6 60.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 48.6 60.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Technology | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 48.4 57.6    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 48.4 57.6    
Fair value measured on a recurring basis | Debt securities issued by corporations | Energy | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 48.0 68.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 48.0 68.5    
Fair value measured on a recurring basis | Debt securities issued by corporations | Consumer | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 26.0 31.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 26.0 31.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Communications | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 19.9 19.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 19.9 19.8    
Fair value measured on a recurring basis | Debt securities issued by corporations | Utilities | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Materials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 16.2 26.3    
Fair value measured on a recurring basis | Debt securities issued by corporations | Materials | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Debt securities issued by corporations | Materials | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 16.2 26.3    
Fair value measured on a recurring basis | Debt securities issued by corporations | Materials | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 169.4 133.5    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 169.4 133.5    
Fair value measured on a recurring basis | Mortgage-backed and asset-backed securities | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Municipal obligations        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 297.4 280.3    
Fair value measured on a recurring basis | Municipal obligations | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Municipal obligations | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 297.4 280.3    
Fair value measured on a recurring basis | Municipal obligations | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Fixed maturity investments        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 1,109.4 1,077.5    
Fair value measured on a recurring basis | Fixed maturity investments | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 184.8 153.2    
Fair value measured on a recurring basis | Fixed maturity investments | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 924.6 924.3    
Fair value measured on a recurring basis | Fixed maturity investments | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Short-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Short-term investments, at fair value 187.1 214.2    
Fair value measured on a recurring basis | Short-term investments | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Short-term investments, at fair value 169.8 204.4 $ 321.7 $ 176.1
Fair value measured on a recurring basis | Short-term investments | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Short-term investments, at fair value 17.3 9.8    
Fair value measured on a recurring basis | Short-term investments | Level 3 Inputs        
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 | Common equity securities | Financials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   13.5    
Fair value measured on a recurring basis | Common equity securities | Financials | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   13.5    
Fair value measured on a recurring basis | Common equity securities | Financials | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Financials | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Health Care        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   14.0    
Fair value measured on a recurring basis | Common equity securities | Health Care | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   14.0    
Fair value measured on a recurring basis | Common equity securities | Health Care | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Health Care | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Industrial        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   11.4    
Fair value measured on a recurring basis | Common equity securities | Industrial | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   11.4    
Fair value measured on a recurring basis | Common equity securities | Industrial | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Industrial | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Technology        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   7.4    
Fair value measured on a recurring basis | Common equity securities | Technology | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   7.4    
Fair value measured on a recurring basis | Common equity securities | Technology | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Technology | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Energy        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   4.1    
Fair value measured on a recurring basis | Common equity securities | Energy | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   4.1    
Fair value measured on a recurring basis | Common equity securities | Energy | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Energy | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Consumer        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   6.2    
Fair value measured on a recurring basis | Common equity securities | Consumer | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   6.2    
Fair value measured on a recurring basis | Common equity securities | Consumer | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Consumer | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Communications        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   12.7    
Fair value measured on a recurring basis | Common equity securities | Communications | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   12.7    
Fair value measured on a recurring basis | Common equity securities | Communications | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Communications | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Materials        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   3.1    
Fair value measured on a recurring basis | Common equity securities | Materials | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   3.1    
Fair value measured on a recurring basis | Common equity securities | Materials | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Materials | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments   0.0    
Fair value measured on a recurring basis | Common equity securities | Exchange traded funds        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 513.1 675.3    
Fair value measured on a recurring basis | Common equity securities | Exchange traded funds | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 499.7 617.0    
Fair value measured on a recurring basis | Common equity securities | Exchange traded funds | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 13.4 58.3    
Fair value measured on a recurring basis | Common equity securities | Exchange traded funds | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Common equity securities | Other        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 196.1 177.9    
Fair value measured on a recurring basis | Common equity securities | Other | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Common equity securities | Other | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 196.1 177.9    
Fair value measured on a recurring basis | Common equity securities | Other | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Common equity securities | Common equity securities        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 709.2 925.6    
Fair value measured on a recurring basis | Common equity securities | Common equity securities | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 499.7 689.4    
Fair value measured on a recurring basis | Common equity securities | Common equity securities | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 209.5 236.2    
Fair value measured on a recurring basis | Common equity securities | Common equity securities | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0 0.0    
Fair value measured on a recurring basis | Other long-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 458.0 138.7    
Fair value measured on a recurring basis | Other long-term investments | Level 1 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0      
Fair value measured on a recurring basis | Other long-term investments | Level 2 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments 0.0      
Fair value measured on a recurring basis | Other long-term investments | Level 3 Inputs        
Debt and Equity Securities, FV-NI [Line Items]        
Fair value investments $ 458.0 $ 138.7