Income Taxes - Schedule of Transactions Affecting Valuation Allowance on Deferred Tax Assets (Detail) (Valuation Allowance of Deferred Tax Assets, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation Allowance of Deferred Tax Assets
Valuation Allowance [Line Items]
Balance, beginning of year	$ 268.2	$ 273.6	$ 273.2
Current year expense - net	1.3	6.4	28.2
Write-offs	(2.8)	(8.3)	(37.9)
Foreign exchange and other	(8.9)	(3.5)	10.1
Balance, end of year	$ 257.8	$ 268.2	$ 273.6