Income Taxes - Income Tax Data from Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income (loss) components:
United States	$ 159.3	$ 44.5	$ 28.5
International	223.0	217.5	152.0
Income from continuing operations before income tax	382.3	262.0	180.5
Current income tax expense (benefit):
United States - federal	(8.5)	16.2	10.6
United States - state and local	0.1	0.7	4.2
International	52.9	54.6	39.6
Total current income tax expense (benefit)	44.5	71.5	54.4
Deferred income tax expense (benefit) components:
United States - federal	31.9	(0.6)	(331.2)
United States - state and local	6.0	5.1	(36.7)
International	(12.3)	(4.7)	3.9
Total deferred income tax expense (benefit)	25.6	(0.2)	(364.0)
Income tax expense (benefit)	$ 70.1	$ 71.3	$ (309.6)
Effective income tax rate	18.30%	27.20%	(171.50%)