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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, 2019	Dec. 31, 2018
Carrying Amount [Member]
Non-derivatives:
Cash and cash equivalents	$ 75.7	$ 123.1
Non-derivatives:
Long-term debt (including current portion)	58.6	207.6
Finance leases (including current portion)	1.5	3.3
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	0.8	0.0
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.0	0.7
Carrying Amount [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Swaps [Member]
Derivatives (Level 1 measurement):
Derivative asset	0.0	1.9
Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	24.6	15.1
Fair Value [Member]
Non-derivatives:
Cash and cash equivalents	75.7	123.1
Non-derivatives:
Long-term debt (including current portion)	58.6	207.6
Finance leases (including current portion)	1.5	3.3
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	0.8	0.0
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.0	0.7
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Swaps [Member]
Derivatives (Level 1 measurement):
Derivative asset	0.0	1.9
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	$ 24.6	$ 15.1

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