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Earnings per Share (Anti Dilutive Securities Not Included in Computation of Diluted EPS) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings per Share [Abstract]    
Antidilutive stock options excluded from diluted shares 3,314,751us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,555,015us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Weighted average price of these options $ 57.19mur_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAveragePrice $ 58.97mur_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAveragePrice