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Earnings Per Share and Capital Structure Stock-based Awards (Details)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Stock-based awards excluded from diluted EPS calculation (antidilutive) 1.4us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1.4us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount