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Investment Securities (Investment Holdings Fixed Maturity Table) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Investment securities    
Fixed maturity investments, at fair value $ 4,988.7 $ 5,030.5
Fixed maturity investments reclassified to assets held for sale   (236.3)
U.S. Government and agency obligations
    
Investment securities    
Cost or amortized cost 539.2 365.5
Trading Securities, Unrealized Holding Gain 0.6 0.5
Trading Securities, Unrealized Holding Loss (0.8) (1.0)
Net foreign currency gains (losses) (0.6) (2.5)
Fixed maturity investments, at fair value 538.4 362.5
Debt securities issued by corporations
    
Investment securities    
Cost or amortized cost 2,311.6 2,330.7
Trading Securities, Unrealized Holding Gain 48.3 44.0
Trading Securities, Unrealized Holding Loss (7.1) (13.2)
Net foreign currency gains (losses) (6.3) (14.3)
Fixed maturity investments, at fair value 2,346.5 2,347.2
Municipal obligations
    
Investment securities    
Cost or amortized cost 33.5 18.3
Trading Securities, Unrealized Holding Gain 0.2 0
Trading Securities, Unrealized Holding Loss (0.2) (0.4)
Net foreign currency gains (losses) 0 0
Fixed maturity investments, at fair value 33.5 17.9
Mortgage-backed and asset-backed securities
    
Investment securities    
Cost or amortized cost 1,847.9 2,027.3
Trading Securities, Unrealized Holding Gain 4.1 2.4
Trading Securities, Unrealized Holding Loss (6.3) (9.9)
Net foreign currency gains (losses) (3.5) (5.3)
Fixed maturity investments, at fair value 1,842.2 2,014.5
Foreign government, agency and provincial obligations
    
Investment securities    
Cost or amortized cost 366.4 444.2
Trading Securities, Unrealized Holding Gain 3.4 3.7
Trading Securities, Unrealized Holding Loss (1.1) (3.2)
Net foreign currency gains (losses) (4.3) (4.8)
Fixed maturity investments, at fair value 364.4 439.9
Preferred Stock
    
Investment securities    
Cost or amortized cost 79.9 79.9
Trading Securities, Unrealized Holding Gain 6.1 5.1
Trading Securities, Unrealized Holding Loss 0 0
Net foreign currency gains (losses) (0.1) (0.2)
Fixed maturity investments, at fair value 85.9 84.8
Fixed Income Investments
    
Investment securities    
Cost or amortized cost 5,178.5 5,265.9
Trading Securities, Unrealized Holding Gain 62.7 55.7
Trading Securities, Unrealized Holding Loss (15.5) (27.7)
Net foreign currency gains (losses) (14.8) (27.1)
Total fixed maturity investments including assets held for sale 5,210.9 5,266.8
OneBeacon Runoff
    
Investment securities    
Fixed maturity investments reclassified to assets held for sale $ (222.2) $ (236.3)