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Earnings Per Share (Details 1) (Stock Appreciation Rights [Member], USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anitdilutive securities excluded from calculation of diluted earnings per share 0.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive securities exlucded from calculation of diluted earnings per share, price range per share $ 92.64us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount  
Minimum [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities exlucded from calculation of diluted earnings per share, price range per share   81.11us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities exlucded from calculation of diluted earnings per share, price range per share   81.14us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockAppreciationRightsSARSMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember