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Investment Securities (Net Unrealized Investment Gains (Losses)) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Trading Securities, Change in Unrealized Holding Gain (Loss) $ (92.5) $ 50.4 $ (11.4) $ (2.5)
Trading Securities, Tax on Unrealized Holding Gain (Loss) on Investments 15.8 (8.6) (3.1) 13.1
Trading Securities Unrealized Holding Gain (Loss) on Investments after Tax (76.7) 41.8 (14.5) 10.6
Foreign Currency Transaction Gain (Loss), Unrealized 37.3 (33.9) 81.6 8.4
Trading Securities, Unrealized Foreign Currency Transaction Gain (Loss) Tax (10.8) 7.4 (20.6) (2.9)
Trading Securities, Unrealized Foreign Currency Gain (Loss) Net of Tax 26.5 (26.5) 61.0 5.5
Net Unrealized Gain (Loss) and Foreign Currency Gain (Loss) on Trading Securities (55.2) 16.5 70.2 5.9
Net Unrealized Gain (Loss) and Foreign Currency Gain (Loss) on Trading Securities Tax 5.0 (1.2) (23.7) 10.2
Net Unrealized Gain (Loss) and Foreign Currency Gain (Loss) on Trading Securities Net of Tax (50.2) 15.3 46.5 16.1
Fixed maturity investments.
        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Trading Securities, Change in Unrealized Holding Gain (Loss) (14.3) 9.3 30.0 (94.8)
Foreign Currency Transaction Gain (Loss), Unrealized 37.6 (30.5) 78.0 6.2
Net Unrealized Gain (Loss) and Foreign Currency Gain (Loss) on Trading Securities 23.3 (21.2) 108.0 (88.6)
Short-term investments
        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Trading Securities, Change in Unrealized Holding Gain (Loss) 0 0    
Foreign Currency Transaction Gain (Loss), Unrealized 0 0.1    
Net Unrealized Gain (Loss) and Foreign Currency Gain (Loss) on Trading Securities 0 0.1    
Common equity securities
        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Trading Securities, Change in Unrealized Holding Gain (Loss) (67.8) 35.6 (42.8) 85.2
Foreign Currency Transaction Gain (Loss), Unrealized (2.1) (2.0) (0.2) (1.0)
Net Unrealized Gain (Loss) and Foreign Currency Gain (Loss) on Trading Securities (69.9) 33.6 (43.0) 84.2
Convertible fixed maturity investments
        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Trading Securities, Change in Unrealized Holding Gain (Loss) (4.0) 2.4 (5.8) (0.5)
Foreign Currency Transaction Gain (Loss), Unrealized 0.1 (0.1) 0.4 0
Net Unrealized Gain (Loss) and Foreign Currency Gain (Loss) on Trading Securities (3.9) 2.3 (5.4) (0.5)
Other long-term investments
        
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Trading Securities, Change in Unrealized Holding Gain (Loss) (6.4) 3.1 7.2 7.6
Foreign Currency Transaction Gain (Loss), Unrealized 1.7 (1.4) 3.4 3.2
Net Unrealized Gain (Loss) and Foreign Currency Gain (Loss) on Trading Securities $ (4.7) $ 1.7 $ 10.6 $ 10.8