Selected Quarterly Data (unaudited) - Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ 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
Quarterly Financial 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
Gross profit	468.3	455.3		483.2		422.3		440.1	440.9		481.8		431.3		1,829.1	1,794.1	1,598.8
Operating income	137.4	192.2		212.8		138.4		161.8	182.8		203.4		152.7		680.8	700.7	616.1
Net income from continuing operations	203.9	127.1		68.3		80.7		109.6	117.5		132.7		91.8		480.0	451.6	397.1
Income (loss) from discontinued operations, net of tax	3.5	0.0		(5.2)		7.1		21.4	22.9		10.1		15.6		5.4	70.0	(466.8)
Gain (loss) from sale / impairment of discontinued operations, net of tax	(17.8)	(1.7)		200.6		0.0		0.0	0.6		0.0		0.0		181.1	0.6	(6.7)
Net income (loss)	$ 189.6	$ 125.4		$ 263.7		$ 87.8		$ 131.0	$ 141.0		$ 142.8		$ 107.4		$ 666.5	$ 522.2	$ (76.4)
Earnings (loss) per ordinary share
Income (Loss) from Continuing Operations, Per Basic Share	$ 1.12	$ 0.70		$ 0.38		$ 0.44		$ 0.60	$ 0.65		$ 0.73		$ 0.50		$ 2.64	$ 2.49	$ 2.20
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	(0.07)	(0.01)		1.07		0.04		0.12	0.13		0.06		0.09		1.03	0.39	(2.62)
Earnings Per Share, Basic	1.05	0.69	[1]	1.45	[1]	0.48	[1]	0.72	0.78	[1]	0.79	[1]	0.59	[1]	3.67	2.88	(0.42)
Income (Loss) from Continuing Operations, Per Diluted Share	1.11	0.69		0.37		0.44		0.60	0.64		0.73		0.50		2.61	2.47	2.17
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	(0.07)	(0.01)		1.06		0.04		0.11	0.13		0.05		0.09		1.02	0.38	(2.59)
Diluted	$ 1.04	$ 0.68	[1]	$ 1.43	[1]	$ 0.48	[1]	$ 0.71	$ 0.77	[1]	$ 0.78	[1]	$ 0.59	[1]	$ 3.63	$ 2.85	$ (0.42)

[1] Amounts may not total to annual earnings because each quarter and year are calculated separately based on basic and diluted weighted-average ordinary shares outstanding during that period.