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Derivatives and Hedging Activities - Effect of Derivative Instruments on Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Earnings on Derivatives | $ (4.3) | $ (11.5) | $ (11.1)
Designated as Hedging Instruments | Cash Flow Hedge |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Earnings on Derivatives | 1.7 | 0.3 | (0.1)
Designated as Hedging Instruments | Foreign Currency Forward Contracts | Cash Flow Hedge |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Earnings on Derivatives | 1.6 | 0.2 | (0.2)
Designated as Hedging Instruments | Treasury Lock | Cash Flow Hedge |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Earnings on Derivatives | 0.1 | 0.1 | 0.1
Designated as Hedging Instruments | Interest Rate Swaps | Fair Value Hedging |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Earnings on Derivatives | 0.6 | 0.5 | 0.5
Not Designated as Hedging Instruments | Foreign Currency Forward Contracts |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Earnings on Derivatives | $ (6.6) | $ (12.3) | $ (11.5)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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