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Financial Instruments - Derivative Instruments Used to Hedge against Balance Sheet Foreign Currency Exposures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Foreign exchange gains (losses) related to balance sheet re-measurement $ (2.6) $ 9.7 $ (5.6)
Foreign Exchange Forward | Other income | Derivatives Not Designated as Hedging Instruments      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Recognized gains (losses) in interest and other income, net $ 8.7 $ (9.2) $ 6.4