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Investment Securities (Investment Holdings Fixed Maturity Table) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
U.S. Government and agency obligations    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or amortized cost $ 199.9 $ 297.8
Trading Securities, Unrealized Holding Gain 0.0 0.0
Trading Securities, Unrealized Holding Loss (2.2) (1.3)
Net foreign currency gains (losses) 0.0 0.0
Fixed maturity investments, at fair value 197.7 296.5
Debt securities issued by corporations    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or amortized cost 760.5 867.6
Trading Securities, Unrealized Holding Gain 0.7 2.9
Trading Securities, Unrealized Holding Loss (17.5) (4.3)
Net foreign currency gains (losses) 0.0 14.7
Fixed maturity investments, at fair value 743.7 880.9
Municipal obligations    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or amortized cost 261.8 252.0
Trading Securities, Unrealized Holding Gain 1.9 3.7
Trading Securities, Unrealized Holding Loss (1.3) (0.8)
Net foreign currency gains (losses) 0.0 0.0
Fixed maturity investments, at fair value 262.4 254.9
Mortgage-backed and asset-backed securities    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or amortized cost 132.5 697.2
Trading Securities, Unrealized Holding Gain 0.1 1.6
Trading Securities, Unrealized Holding Loss (2.6) (4.1)
Net foreign currency gains (losses) 0.0 0.0
Fixed maturity investments, at fair value 130.0 694.7
Foreign government, agency and provincial obligations    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or amortized cost   2.6
Trading Securities, Unrealized Holding Gain   0.0
Trading Securities, Unrealized Holding Loss   0.0
Net foreign currency gains (losses)   0.1
Fixed maturity investments, at fair value   2.7
Fixed Income Investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or amortized cost 1,354.7 2,117.2
Trading Securities, Unrealized Holding Gain 2.7 8.2
Trading Securities, Unrealized Holding Loss (23.6) (10.5)
Net foreign currency gains (losses) 0.0 14.8
Total fixed maturity investments including assets held for sale $ 1,333.8 $ 2,129.7