XML 13 R54.htm IDEA: XBRL DOCUMENT v2.4.1.9
Income Taxes - Textual (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Contingency [Line Items]      
Provision for income tax expense $ 30.3us-gaap_IncomeTaxExpenseBenefit $ 32.8us-gaap_IncomeTaxExpenseBenefit  
Net Deferred Tax Assets, Total 290.7us-gaap_DeferredTaxAssetsNet    
Deferred Tax Assets, Valuation Allowance 23.0us-gaap_DeferredTaxAssetsValuationAllowance    
Gross Operating Loss Carryforwards 559us-gaap_OperatingLossCarryforwards    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 13.8us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense    
Gross Unrecognized Tax Benefits 2.4us-gaap_UnrecognizedTaxBenefits   0.9us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 2.4us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate   0.9us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Federal      
Income Tax Contingency [Line Items]      
Deferred Tax Assets, Net Operating Loss Carryforwards $ 195.6us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember