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Fair Value of Financial Instruments Additional Information (Details) - Forward contracts - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]          
Derivative, notional amount $ 465.5   $ 465.5   $ 217.7
Accrued expenses          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair value foreign currency forward contracts, liabilities 0.2   0.2   $ 0.3
Other income, net          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Recognized gains (losses) of foreign currency forward contracts $ 3.0 $ 2.5 (1.9) $ (14.1)  
Other, net          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Change in the fair value of foreign currency forward contracts     1.9 14.1  
Cash settlements     $ 2.0 $ 13.0