Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits - beginning of year	$ 38.2	$ 31.0	$ 23.7
Gross additions - current year tax positions	10.7	4.6	8.7
Gross additions - prior year tax positions	10.4	8.3	2.2
Gross additions (reductions) - purchase accounting adjustments	9.7	0.1	(1.1)
Gross reductions - prior year tax positions	(9.8)	(2.1)	(2.5)
Gross reductions - settlements with taxing authorities	(1.0)	(3.6)
Impact of change in foreign exchange rates	0.0	(0.1)
Unrecognized tax benefits - end of year	$ 58.2	$ 38.2	$ 31.0

Schedule of Unrecognized Tax Benefits [Line Items]

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- Definition

Unrecognized Tax Benefits Increases and/or Decreases Resulting From Purchase Accounting

+ References

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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