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Investments Fixed Maturity Securities by Type (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fixed maturity securities (amortized cost) $ 7,967.4 $ 8,019.6
Available for sale, Fixed maturity securities (estimated fair value) 8,135.8 8,170.9
Held to maturity (amortized cost) 1,056.9 974.8
Held to maturity (estimated fair value) 1,040.5 947.4
U.S. & Canadian Governments [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fixed maturity securities (amortized cost) 1,444.5 1,419.7
Available for sale, Fixed maturity securities (gross unrealized gains) 12.2 12.6
Available for sale, Fixed maturity securities (gross unrealized losses) 3.9 5.5
Available for sale, Fixed maturity securities (estimated fair value) 1,452.8 1,426.8
Tax-exempt [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Held to maturity (amortized cost) 1,056.9 974.8
Held to maturity (gross unrealized gains) 3.3 0.7
Held to maturity (gross unrealized losses) 19.7 28.0
Held to maturity (estimated fair value) 1,040.5 947.4
Corporate [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fixed maturity securities (amortized cost) 6,522.8 6,599.8
Available for sale, Fixed maturity securities (gross unrealized gains) 182.3 175.0
Available for sale, Fixed maturity securities (gross unrealized losses) 22.2 30.7
Available for sale, Fixed maturity securities (estimated fair value) 6,682.9 6,744.1
Fixed Maturity Securities [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Table] [Line Items]    
Available for sale, Fixed maturity securities (amortized cost) 7,967.4 8,019.6
Available for sale, Fixed maturity securities (gross unrealized gains) 194.5 187.6
Available for sale, Fixed maturity securities (gross unrealized losses) 26.1 36.3
Available for sale, Fixed maturity securities (estimated fair value) $ 8,135.8 $ 8,170.9