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Investments Gross Unrealized Losses and Fair Value (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fair Value, Less than 12 Months $ 2,266.4 $ 393.7
Available for sale, Unrealized Losses, Less than 12 Months 148.1 2.3
Available for sale, Fair Value, 12 Months or Greater 27.6 107.4
Available for sale, Unrealized Losses, 12 Months or Greater 8.9 1.0
Available for sale, Fair Value, Total 2,294.1 501.1
Available for sale, Unrealized Losses, Total 157.0 3.3
U.S. & Canadian Governments [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fair Value, Less than 12 Months 12.8 217.2
Available for sale, Unrealized Losses, Less than 12 Months 0.0 0.3
Available for sale, Fair Value, 12 Months or Greater 0.0 53.0
Available for sale, Unrealized Losses, 12 Months or Greater 0.0 0.1
Available for sale, Fair Value, Total 12.9 270.3
Available for sale, Unrealized Losses, Total 0.0 0.4
Tax-exempt [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fair Value, Less than 12 Months 6.5 0.0
Available for sale, Unrealized Losses, Less than 12 Months 0.0 0.0
Available for sale, Fair Value, 12 Months or Greater 21.5 21.7
Available for sale, Unrealized Losses, 12 Months or Greater 0.0 0.0
Available for sale, Fair Value, Total 28.1 21.7
Available for sale, Unrealized Losses, Total $ 0.0 $ 0.0
Held-to-maturity Securities [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Number of securities in continuous unrealized loss position for less than 12 months 3 0
Number of securities in continuous unrealized loss position for 12 months or greater 8 8
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 11 8
Corporate [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fair Value, Less than 12 Months $ 2,253.5 $ 176.4
Available for sale, Unrealized Losses, Less than 12 Months 148.1 1.9
Available for sale, Fair Value, 12 Months or Greater 27.6 54.3
Available for sale, Unrealized Losses, 12 Months or Greater 8.9 0.8
Available for sale, Fair Value, Total 2,281.2 230.7
Available for sale, Unrealized Losses, Total $ 157.0 $ 2.8
Available-for-sale Securities [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Number of securities in continuous unrealized loss position for less than 12 months 459 54
Number of securities in continuous unrealized loss position for 12 months or greater 26 47
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 485 101