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Income Taxes - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Reduction in valuation allowance due to foreign tax credit carryforwards $ (1.6) $ (11.5)  
Deferred tax benefit due to re-valuation of deferred taxes from a change in enacted tax rates in the United Kingdom 11.2 7.3 7.6
Effect of changes in tax law, rates 1.40% 2.00% 2.10%
Temporary difference due to repatriation of assets from a sale or liquidation of the subsidiary 47.7    
Amount of deferred taxes not recognized 17.9    
State net operating loss carryforwards, expiration period 15 years    
Foreign tax credit carryforwards, expiration period 5 years    
Liability for uncertain tax positions including interest and related charges 20.4 22.6 21.2
Accrued income tax interest and related charges 1.7 2.2 1.6
Unrecognized tax benefits that, if recognized, would affect effective tax rate 17.2 19.4 12.6
Reductions for prior years' tax provisions 0.1 5.4 0
Additions based on prior years' tax positions $ 0 $ 5.2 $ 0