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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net sales	$ 865.7	$ 830.0	$ 2,545.2	$ 2,456.4
United States
Segment Reporting Information [Line Items]
Net sales	606.5	565.4	1,772.6	1,671.9
Europe
Segment Reporting Information [Line Items]
Net sales	107.4	118.8	322.6	365.3
Japan
Segment Reporting Information [Line Items]
Net sales	41.6	41.9	125.8	123.1
Other
Segment Reporting Information [Line Items]
Net sales	$ 110.2	$ 103.9	$ 324.2	$ 296.1