Derivative Instruments and Hedging Activities Carrying Values of Derivative Instruments (Detail) - Designated as Hedging Instrument - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative Net Carrying Value	$ (18.6)	$ (20.4)
Foreign currency contracts
Derivative [Line Items]
Derivative Net Carrying Value	(3.5)	(2.3)
Interest rate contract
Derivative [Line Items]
Derivative Net Carrying Value	(15.1)	(18.1)
Prepaid Expenses and Other Current Assets
Derivative [Line Items]
Fair Value— Assets	0.6	1.0
Prepaid Expenses and Other Current Assets \| Foreign currency contracts
Derivative [Line Items]
Fair Value— Assets	0.6	1.0
Prepaid Expenses and Other Current Assets \| Interest rate contract
Derivative [Line Items]
Fair Value— Assets	0.0	(18.1)
Other Current Liabilities
Derivative [Line Items]
Fair Value— (Liabilities)	(19.2)	(21.4)
Other Current Liabilities \| Foreign currency contracts
Derivative [Line Items]
Fair Value— (Liabilities)	$ (4.1)	$ (3.3)

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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-Publisher FASB
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-Topic 860
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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
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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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.

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