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Fair Value Measurements - Carrying Amount and Fair Values of the Company's Assets and Liabilities Measured on a Recurring Basis (Detail) - Recurring [Member] - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Carrying Amount [Member]
Non-derivatives:
Cash and cash equivalents	$ 94.4	$ 105.3
Non-derivatives:
Finance leases (including current portion)	0.2	0.6
Carrying Amount [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	1.1	0.0
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.0	0.5
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	17.8	17.2
Fair Value [Member]
Non-derivatives:
Cash and cash equivalents	94.4	105.3
Non-derivatives:
Finance leases (including current portion)	0.2	0.6
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	1.1	0.0
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.0	0.5
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	$ 17.8	$ 17.2

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Stock equivalent units fair value disclosure.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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