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Financial Instruments - Gross Notional Amounts for Outstanding Derivatives (Details) - Forward contracts - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Derivatives Designated as Hedging Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | $ 154.3 | $ 154.5
Derivatives Designated as Hedging Instruments | Prepaid and other current assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | 0.9 | 1.3
Derivatives Designated as Hedging Instruments | Other accrued liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | 4.3 | 0.5
Derivatives Not Designated as Hedging Instruments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | 309.8 | 227.2
Derivatives Not Designated as Hedging Instruments | Prepaid and other current assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | 0.7 | 2.2
Derivatives Not Designated as Hedging Instruments | Other accrued liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Notional amounts of outstanding currency forward contracts | $ 5.4 | $ 0.7

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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