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Investment Securities (Net Realized Investment Gains (Losses)) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Debt and Equity Securities, FV-NI [Line Items]        
Trading Securities, Realized Gain (Loss) $ (10.2) $ 7.4 $ (24.9) $ 21.0
Trading securities, Tax on Realized Holding Gain (Loss) on Investments 2.3 (0.6) 11.2 (3.6)
Trading securities realized holding gain (loss) on investments after tax (7.9) 6.8 (13.7) 17.4
Foreign Currency Transaction Gain (Loss), Realized 0.0 (0.6) 11.0 (0.2)
Trading Securities, Tax on Realized Foreign Currency Transaction Gain (Loss) Tax 0.0 0.0 0.0 0.0
Trading securities, realized foreign currency gain (loss) net of tax 0.0 (0.6) 11.0 (0.2)
Net realized investment (losses) gains, pre-tax (10.2) 6.8 (13.9) 20.8
Tax on Net Realized Gain (Loss) and Foreign Currency Gain (Loss) on Trading Securities 2.3 (0.6) 11.2 (3.6)
Net Realized Gain (Loss) and Foreign Currency Gain (Loss) on Trading Securities Net of Tax (7.9) 6.2 (2.7) 17.2
Fixed maturity investments        
Debt and Equity Securities, FV-NI [Line Items]        
Trading Securities, Realized Gain (Loss) (5.1) 0.6 (27.6) (0.4)
Foreign Currency Transaction Gain (Loss), Realized 0.0 1.2 18.2 2.7
Net realized investment (losses) gains, pre-tax (5.1) 1.8 (9.4) 2.3
Short-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Trading Securities, Realized Gain (Loss) 0.0 (0.1) (0.8) (0.1)
Foreign Currency Transaction Gain (Loss), Realized 0.0 0.0 0.0 0.0
Net realized investment (losses) gains, pre-tax 0.0 (0.1) (0.8) (0.1)
Common equity securities        
Debt and Equity Securities, FV-NI [Line Items]        
Trading Securities, Realized Gain (Loss) (1.5) 4.9 10.5 18.5
Foreign Currency Transaction Gain (Loss), Realized 0.0 5.4 0.0 6.0
Net realized investment (losses) gains, pre-tax (1.5) 10.3 10.5 24.5
Other long-term investments        
Debt and Equity Securities, FV-NI [Line Items]        
Trading Securities, Realized Gain (Loss) (3.6) 2.0 (7.0) 3.0
Foreign Currency Transaction Gain (Loss), Realized 0.0 (7.2) (7.2) (8.9)
Net realized investment (losses) gains, pre-tax $ (3.6) $ (5.2) $ (14.2) $ (5.9)