Net Sales Based on Location of External Customer and Identifiable Assets by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net sales	$ 941.9	$ 865.7	$ 2,746.9	$ 2,545.2
United States
Segment Reporting Information [Line Items]
Net sales	646.0	606.5	1,904.5	1,772.6
Europe
Segment Reporting Information [Line Items]
Net sales	108.6	107.4	328.6	322.6
Japan
Segment Reporting Information [Line Items]
Net sales	60.1	41.6	150.5	125.8
Other
Segment Reporting Information [Line Items]
Net sales	$ 127.2	$ 110.2	$ 363.3	$ 324.2