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Derivatives and Fair Value Measurements (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Derivatives, Fair Value [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements   $ 257,300,000  
Company's foreign currency and commodity positions by Year of Maturity and Account Classification      
Fair Value Net Liability     $ 0
Timing differences between the hedge settlement and the purchase transaction   Less than a day and up to a maximum of 30 days  
Scenario, Forecast [Member] | Foreign currency forward contracts [Member]      
Company's foreign currency and commodity positions by Year of Maturity and Account Classification      
Net loss to be reclassified from accumulated other comprehensive loss to earnings over the next 12 months $ 93,000,000