Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Income Tax Examination [Line Items]    
Net deferred tax liability $ 2.1 $ 2.4
Income tax receivable 20.1 27.3
Income tax refunds 14.4  
Net operating loss carryforwards 689.1  
Estimated amount of net operating loss carryforwards that will not be utilized 298.6  
Foreign tax credit carryforwards, subject to expriration 16.9  
Valuation allowance 454.1 448.4
Unrecognized tax benefits that would impact effective tax rate 24.8 25.8
Unrecognized Tax Benefits, Interest on Income Taxes Expense 1.4 2.2
Interest accrual reversal 2.6 5.6
Interest accrued net reduction 1.2 3.4
Total amount of interest accrued for uncertain tax positions 14.5 15.7
Amount by which unrecognized tax benefits may decrease over the next 12 months 21.2  
State and Foreign Tax Authority [Member]
    
Income Tax Examination [Line Items]    
Tax paid to settle audits of tax years 2001-08 for certain subsidiaries 1.2  
Interest paid to settle audits of tax years 2001-08 for certain subsidiaries $ 0.8