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Income Taxes, Balances (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure    
Effective income tax rate 39.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Federal    
Income Tax Disclosure    
Income tax refund received 65.8us-gaap_ProceedsFromIncomeTaxRefunds
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember