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Fair Value of Financial Instruments Fair Value of Financial Instruments - Additional Information (Details) - Forward Contracts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Option, Quantitative Disclosures [Line Items]      
Derivative, notional amount $ 217.7 $ 479.9  
Accrued liabilities      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 0.3    
Other accounts receivable      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Fair value of foreign currency forward contracts, assets   0.6  
Other income (expenses), net      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Recognized gains (losses) of foreign currency forward contracts (38.5) (17.8) $ (1.1)
Other, net      
Fair Value, Option, Quantitative Disclosures [Line Items]      
Change in the fair value of foreign currency forward contracts 38.5 17.8 1.1
Cash settlements $ (37.6) $ (18.3) $ (1.8)