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Retirement and Postretirement Plans (Qualifed, Non-qualified, and Accumulated Benefit Obligations) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Amounts recognized in accumulated other comprehensive income (loss) on a pre-tax basis noncontrolling interest    
Accumulated other comprehensive loss beginning balance $ (21.2) $ (16.7)
Increase (decrease) in accumulated other comprehensive income (loss):    
Amortization of net actuarial losses recognized during the year 0.9 0.8
Net actuarial (losses) gains occurring during the year 30.8 [1] (5.9) [1]
Other adjustments 0 0.6
Accumulated other comprehensive income (loss) ending balance 10.5 (21.2)
OneBeacon Ltd.
    
Increase (decrease) in accumulated other comprehensive income (loss):    
Amount expected to be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost during 2012   0.3
Qualified Plan
    
Information for the Qualified Plan, which had accumulated benefit obligations less than plan assets    
Projected benefit obligation 78.7 91.9
Accumulated benefit obligation 78.7 91.9
Fair value of plan net assets 142.8 [2] 124.7 [2]
Non-qualified Plan
    
Information for the Non-qualified Plan, which had accumulated benefit obligations in excess of plan assets    
Projected benefit obligation 24.2 27.6
Accumulated benefit obligation 24.2 27.6
Fair value of plan assets $ 0 $ 0
[1] Net actuarial gains (losses) resulted from investment returns and demographic experience different than assumed, as well as changes in assumptions in estimating the projected benefit obligation in the years ended December 31, 2013 and 2012.
[2] Includes receivables related to securities sold, interest and dividends as well as payables related to securities purchased.