Net Sales Based on Location of External Customer and Identifiable Assets by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net sales	$ 859.8	$ 827.1	$ 1,679.5	$ 1,626.4
United States
Segment Reporting Information [Line Items]
Net sales	592.0	555.1	1,166.1	1,106.5
Europe
Segment Reporting Information [Line Items]
Net sales	108.8	126.4	215.2	246.5
Japan
Segment Reporting Information [Line Items]
Net sales	43.2	42.3	84.2	81.2
Other
Segment Reporting Information [Line Items]
Net sales	$ 115.8	$ 103.3	$ 214.0	$ 192.2