Net Sales Based on Location of External Customer and Identifiable Assets by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 873.5	$ 819.7
United States
Segment Reporting Information [Line Items]
Net sales	625.4	574.1
Europe
Segment Reporting Information [Line Items]
Net sales	104.3	106.4
Japan
Segment Reporting Information [Line Items]
Net sales	34.6	41.0
Other
Segment Reporting Information [Line Items]
Net sales	$ 109.2	$ 98.2