Net Sales Based on Location of External Customer and Identifiable Assets by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 819.7	$ 799.3
United States
Segment Reporting Information [Line Items]
Net sales	574.1	551.4
Europe
Segment Reporting Information [Line Items]
Net sales	106.4	120.1
Japan
Segment Reporting Information [Line Items]
Net sales	41.0	38.9
Other
Segment Reporting Information [Line Items]
Net sales	$ 98.2	$ 88.9