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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Effective income tax rate 14.10% 19.20%  
Blended federal and state statutory income tax rate 38.60% 38.70%  
Income Tax Contingency [Line Items]      
Deferred tax assets, valuation allowance     $ 72.5
Unrecognized tax benefits 13.8   13.6
Accrued interest and penalties related to uncertain tax positions 2.3   2.4
Portion of unrecognized tax benefits, including accrued interest and penalties, that if recognized, would impact the effective tax rate 14.0   13.8
Reasonably possible change in unrecognized tax benefits, lower bound 0.5    
Reasonably possible change in unrecognized tax benefits, upper bound 0.6    
Other long-term liabilities, net [Member]
      
Income Tax Contingency [Line Items]      
Unrecognized tax benefits 0.8   1.0
Accrued and other current liabilities [Member]
      
Income Tax Contingency [Line Items]      
Unrecognized tax benefits 0.8   0.9
Deferred income tax liabilities [Member]
      
Income Tax Contingency [Line Items]      
Unrecognized tax benefits 12.2   11.7
Minimum [Member]
      
Income Tax Contingency [Line Items]      
Deferred tax assets, valuation allowance, period of anticipated future reversal 9 months    
Maximum [Member]
      
Income Tax Contingency [Line Items]      
Deferred tax assets, valuation allowance, period of anticipated future reversal 12 months    
U.S. Deferred Income Tax Assets [Member]
      
Income Tax Contingency [Line Items]      
Deferred tax assets, valuation allowance     67.7
Income tax expense (benefit) [Member] | Minimum [Member]
      
Income Tax Contingency [Line Items]      
Deferred tax assets, valuation allowance, anticipated income tax benefit from future reversal 40.0    
Income tax expense (benefit) [Member] | Maximum [Member]
      
Income Tax Contingency [Line Items]      
Deferred tax assets, valuation allowance, anticipated income tax benefit from future reversal $ 50.0