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Investments Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fair Value, 12 Months or Less $ 647.9 $ 3,129.5
Available for sale, Unrealized Losses, 12 Months or Less 10.5 190.4
Available for sale, Fair Value, Greater than 12 Months 481.7 427.0
Available for sale, Unrealized Losses, Greater than 12 Months 39.8 68.9
Available for sale, Fair Value, Total 1,129.6 3,556.6
Available for sale, Unrealized Losses, Total 50.3 259.3
U.S. & Canadian Governments [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fair Value, 12 Months or Less 70.1 363.3
Available for sale, Unrealized Losses, 12 Months or Less 0.0 2.8
Available for sale, Fair Value, Greater than 12 Months 1.2 59.2
Available for sale, Unrealized Losses, Greater than 12 Months 0.0 0.7
Available for sale, Fair Value, Total 71.4 422.6
Available for sale, Unrealized Losses, Total 0.0 3.6
Tax-exempt [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Held to maturity, Fair Value, 12 Months or Less 141.0 49.5
Held to maturity, Unrealized Losses, 12 Months or Less 0.5 0.1
Held to maturity, Fair Value, Greater than 12 Months 0.0 0.0
Held to maturity, Unrealized Losses, Greater than 12 Months 0.0 0.0
Held to maturity, Fair Value, Total 141.0 49.5
Held to maturity, Unrealized Losses, Total 0.5 0.1
Corporate [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fair Value, 12 Months or Less 219.7 2,214.5
Available for sale, Unrealized Losses, 12 Months or Less 2.6 100.0
Available for sale, Fair Value, Greater than 12 Months 287.0 336.4
Available for sale, Unrealized Losses, Greater than 12 Months 14.7 50.2
Available for sale, Fair Value, Total 506.7 2,550.9
Available for sale, Unrealized Losses, Total 17.4 150.2
Fixed Maturity Securities [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale and Held to maturity, Fair Value, 12 Months or Less 430.8 2,627.4
Available for sale and Held to maturity, Unrealized Losses, 12 Months or Less 3.2 103.0
Available for sale and Held to maturity, Fair Value, Greater than 12 Months 288.2 395.7
Available for sale and Held to maturity, Unrealized Losses, Greater than 12 Months 14.7 50.9
Available for sale and Held to maturity, Fair Value, Total 719.1 3,023.1
Available for sale and Held to maturity, Unrealized Losses, Total 18.0 154.0
Equity Securities [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fair Value, 12 Months or Less 217.0 502.1
Available for sale, Unrealized Losses, 12 Months or Less 7.3 87.3
Available for sale, Fair Value, Greater than 12 Months 193.4 31.3
Available for sale, Unrealized Losses, Greater than 12 Months 25.0 17.9
Available for sale, Fair Value, Total 410.4 533.4
Available for sale, Unrealized Losses, Total $ 32.3 $ 105.3