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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, 2016	Dec. 31, 2015
Carrying Amount [Member]
Non-derivatives:
Cash and cash equivalents	$ 101.9	$ 136.9
Short-term investments	0.0	4.8
Non-derivatives:
Long-term debt (including current portion)	268.8	131.6
Finance leases (including current portion)	4.5	3.1
Carrying Amount [Member] | Derivatives (Level 1 Measurement) [Member] | Interest Rate Swaps [Member]
Derivatives (Level 1 measurement):
Interest rate swaps	0.4	0.0
Carrying Amount [Member] | Derivatives (Level 1 Measurement) [Member] | Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.6	0.3
Carrying Amount [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	9.8	7.8
Acquisition-related contingent consideration	1.1	54.6
Fair Value [Member]
Non-derivatives:
Cash and cash equivalents	101.9	136.9
Short-term investments	0.0	4.8
Non-derivatives:
Long-term debt (including current portion)	268.8	131.6
Finance leases (including current portion)	4.5	3.1
Fair Value [Member] | Derivatives (Level 1 Measurement) [Member] | Interest Rate Swaps [Member]
Derivatives (Level 1 measurement):
Interest rate swaps	0.4	0.0
Fair Value [Member] | Derivatives (Level 1 Measurement) [Member] | Foreign Currency Forward Exchange Contracts [Member]
Derivatives (Level 1 measurement):
Foreign currency forward exchange contracts	0.6	0.3
Fair Value [Member] | Non-financial Assets and Liabilities (Level 3 Measurement) [Member]
Non-financial liabilities (Level 3 measurement):
Stock equivalent units	9.8	7.8
Acquisition-related contingent consideration	$ 1.1	$ 54.6

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Derivative liabilities.

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Non-derivatives assets.

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+ References

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

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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