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Earnings Per Share - Antidilutive Securities (Details)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Stock Option [Member]  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Antidilutive securities excluded from the computation of earnings per share 1.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
Restricted Stock Units [Member]  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Antidilutive securities excluded from the computation of earnings per share 0.4us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember