Segment Information - Geographic Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Geographic Information [Line Items]
Net sales	$ 1,260.9	$ 1,226.8	$ 1,265.3	$ 1,183.5	$ 1,188.1	$ 1,210.7	$ 1,301.2	$ 1,190.0	$ 4,936.5	$ 4,890.0	$ 4,616.4
Long-lived assets	545.5				538.6				545.5	538.6	539.8
U.S.
Geographic Information [Line Items]
Net sales									2,973.7	2,897.1	2,634.0
Long-lived assets	301.4				309.5				301.4	309.5	285.9
Western Europe
Geographic Information [Line Items]
Net sales									827.2	796.0	727.6
Long-lived assets	61.7				138.6				61.7	138.6	150.7
Developing (1)
Geographic Information [Line Items]
Net sales									723.7	704.0	731.6
Long-lived assets	157.1				65.2				157.1	65.2	60.3
Other Developed (2)
Geographic Information [Line Items]
Net sales									411.9	492.9	523.2
Long-lived assets	$ 25.3				$ 25.3				$ 25.3	$ 25.3	$ 42.9