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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, 2017	Dec. 31, 2016
Carrying Amount [Member]
Non-derivatives:
Cash and cash equivalents	$ 90.2	$ 101.9
Non-derivatives:
Long-term debt (including current portion)	218.4	268.8
Finance leases (including current portion)	5.9	4.5
Carrying Amount [Member] | Derivatives (Level 1 Measurement) [Member] | Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Derivative asset	1.1	0.0
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.0	0.6
Carrying Amount [Member] | Derivatives (Level 1 Measurement) [Member] | Interest Rate Swaps [Member]
Derivatives (Level 1 measurement):
Derivative asset	1.5	0.4
Carrying Amount [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	13.6	9.8
Fair Value [Member]
Non-derivatives:
Cash and cash equivalents	90.2	101.9
Non-derivatives:
Long-term debt (including current portion)	218.4	268.8
Finance leases (including current portion)	5.9	4.5
Fair Value [Member] | Derivatives (Level 1 Measurement) [Member] | Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Derivative asset	1.1	0.0
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.0	0.6
Fair Value [Member] | Derivatives (Level 1 Measurement) [Member] | Interest Rate Swaps [Member]
Derivatives (Level 1 measurement):
Derivative asset	1.5	0.4
Fair Value [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	$ 13.6	$ 9.8

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Finance leases fair value disclosure.

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Non-derivatives liabilities.

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Non-financial liabilities.

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- Definition

Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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