Income Taxes - Schedule of Transactions Affecting Valuation Allowance on Deferred Tax Assets (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation Allowance [Line Items]
Balance, beginning of year	$ 130.8	$ 144.3	$ 132.8
Current year expense-net	35.2	11.8	20.9
Write-offs	(1.0)	(15.0)	(2.5)
Foreign exchange and other	(10.9)	(10.3)	(6.9)
Balance, end of year	$ 154.1	$ 130.8	$ 144.3