Derivative Financial Instruments - Summary of Fair Value Level 2 Inputs of Company's Derivatives (Detail) - Level 2 [Member] - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative liability (assets)	$ 4.7	$ 15.8
Designated as Hedging Instrument [Member] \| Other Long-Term (Assets) [Member] \| Cross Currency Swap Agreements [Member]
Derivative [Line Items]
Derivative assets	(7.4)
Designated as Hedging Instrument [Member] \| Other Long-Term (Assets) [Member] \| Interest Rate Swap Agreement [Member]
Derivative [Line Items]
Derivative assets	(0.3)	(0.5)
Designated as Hedging Instrument [Member] \| Other Long-Term Liabilities [Member] \| Cross Currency Swap Agreements [Member]
Derivative [Line Items]
Derivative liability		8.4
Designated as Hedging Instrument [Member] \| Other Long-Term Liabilities [Member] \| Interest Rate Swap Agreement [Member]
Derivative [Line Items]
Derivative liability	$ 12.4	$ 7.9

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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-Topic 860
-SubTopic 20
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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
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- Definition

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