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Financial Instruments - Derivative Instruments Used to Hedge against Balance Sheet Foreign Currency Exposures (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Foreign exchange gains (losses) related to balance sheet re-measurement | $ 10.9 | $ (1.5) | $ (2.6)
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 | $ (12.3) | $ 6.4 | $ 8.7

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