Income Taxes - Changes in Amount of Uncertain Tax Positions (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in unrecognized tax benefits:
Unrecognized tax benefits at beginning of year	$ 9.7	$ 10.4	$ 15.9
Net increase (decrease):
Tax positions taken in prior periods	(0.1)	(0.3)	(5.4)
Tax positions taken in current period	2.5	1.1	1.1
Lapse due to applicable statute of limitations	(0.2)	(0.2)
Settlements with taxing authorities	(2.3)
Change in currency exchange rates	0.3	(1.3)	(1.2)
Unrecognized tax benefits at end of year	$ 9.9	$ 9.7	$ 10.4

Unrecognized tax benefits increases decreases.

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- Definition

Unrecognized tax benefits increases (decreases) resulting from foreign currency translation.

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No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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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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- Definition

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

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- Definition

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

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- Definition

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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- Definition

Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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