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, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation Allowance [Line Items]
Balance, beginning of year	$ 257.8	$ 268.2	$ 273.6
Current year expense-net	16.1	1.3	6.4
Write-offs	(20.3)	(2.8)	(8.3)
Foreign exchange and other	(20.1)	(8.9)	(3.5)
Balance, end of year	$ 233.5	$ 257.8	$ 268.2