Net Sales Based on Location of External Customer and Identifiable Assets by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 867.2	$ 830.0	$ 827.1	$ 799.3	$ 791.3	$ 758.0	$ 759.9	$ 740.3	$ 3,323.6		$ 3,049.5		$ 2,958.1
Long-lived assets	888.9				682.4				888.9		682.4		457.9
United States
Segment Reporting Information [Line Items]
Net sales									2,263.5		2,014.1		1,967.7
Long-lived assets	809.0				612.5				809.0		612.5		390.5
Europe
Segment Reporting Information [Line Items]
Net sales									488.5	[1]	474.4	[1]	461.8	[1]
Long-lived assets	56.5				52.3				56.5		52.3		49.6
Japan
Segment Reporting Information [Line Items]
Net sales									164.4		164.0		163.2
Other
Segment Reporting Information [Line Items]
Net sales									407.2	[1]	397.0	[1]	365.4	[1]
Long-lived assets	$ 23.4				$ 17.6				$ 23.4		$ 17.6		$ 17.8

[1] Beginning in 2014, certain emerging markets in Europe are included in the "other" geographic region. Prior year amounts have been reclassified to conform to the current year presentation.