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Fair Value of Financial Instruments Additional Information (Details) - Forward contracts - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]          
Derivative, notional amount $ 452.9   $ 452.9   $ 217.7
Accrued expenses          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Fair value foreign currency forward contracts, liabilities 0.3   0.3   $ 0.3
Other (expenses) income, net          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Recognized (losses) gains of foreign currency forward contracts $ (10.7) $ 3.8 (4.9) $ (16.6)  
Other, net          
Fair Value, Option, Quantitative Disclosures [Line Items]          
Change in the fair value of foreign currency forward contracts     4.9 16.6  
Cash settlements     $ 4.8 $ 15.7