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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	Dec. 31, 2018	Dec. 31, 2017
Carrying Amount [Member]
Non-derivatives:
Cash and cash equivalents	$ 123.1	$ 90.2
Non-derivatives:
Long-term debt (including current portion)	207.6	218.4
Finance leases (including current portion)	3.3	5.9
Carrying Amount [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Derivative asset	0.0	1.1
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.7	0.0
Carrying Amount [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Swaps [Member]
Derivatives (Level 1 measurement):
Derivative asset	1.9	1.5
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	15.1	13.6
Fair Value [Member]
Non-derivatives:
Cash and cash equivalents	123.1	90.2
Non-derivatives:
Long-term debt (including current portion)	207.6	218.4
Finance leases (including current portion)	3.3	5.9
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Derivative asset	0.0	1.1
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.7	0.0
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Swaps [Member]
Derivatives (Level 1 measurement):
Derivative asset	1.9	1.5
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	$ 15.1	$ 13.6

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Derivative liabilities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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