Supplemental Guarantor Information - Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 713.6			$ 711.4			$ 2,202.0	$ 2,224.6
Cost of goods sold	458.6			467.6			1,424.7	1,444.9
Gross profit	255.0			243.8			777.3	779.7
Selling, general and administrative expenses	126.4			116.3			405.9	399.0
Research and development expenses	19.8			19.1			61.2	57.0
Segment income	108.8			108.4			310.2	323.7
(Earnings) loss from continuing operations of investment in subsidiaries	0.0			0.0			0.0	0.0
Other (income) expense:
Loss on sale of business	0.1			0.2			(3.3)	6.4
Loss on early extinguishment of debt	0.0			0.0			0.0	17.1
Net interest expense	6.9			4.3			23.6	27.9
Other Income	0.6			2.1			(11.7)	(1.7)
Income from continuing operations before income taxes	101.2			101.8			301.6	274.0
Provision for income taxes	9.9			10.6			42.8	46.5
Net income from continuing operations	91.3			91.2			258.8	227.5
Income (loss) from discontinued operations, net of tax	1.0			18.9			(0.9)	27.0
Discontinued Operation, Income (Loss) From Investment In Subsidiaries	0.0			0.0			0.0	0.0
Net income	92.3	$ 114.3	$ 51.3	110.1	$ 41.5	$ 102.9	257.9	254.5
Comprehensive income, net of tax
Changes in cumulative translation adjustment	(25.8)			(2.1)			(28.3)	23.1
Changes in market value of derivative financial instruments, net of tax	21.9			(1.0)			22.8	(0.7)
Comprehensive income	88.4			107.0			252.4	276.9
Parent Company Guarantor
Condensed Financial Statements, Captions [Line Items]
Net sales	0.0			0.0			0.0	0.0
Cost of goods sold	0.0			0.0			0.0	0.0
Gross profit	0.0			0.0			0.0	0.0
Selling, general and administrative expenses	9.9			2.3			15.6	10.4
Research and development expenses	0.0			0.0			0.0	0.0
Segment income	(9.9)			(2.3)			(15.6)	(10.4)
(Earnings) loss from continuing operations of investment in subsidiaries	(101.2)			(93.5)			(274.4)	(240.4)
Other (income) expense:
Loss on sale of business	0.0			0.0			0.0	0.0
Loss on early extinguishment of debt								0.0
Net interest expense	0.0			0.0			0.0	0.0
Other Income	0.0			0.0			0.0	0.0
Income from continuing operations before income taxes	91.3			91.2			258.8	230.0
Provision for income taxes	0.0			0.0			0.0	2.5
Net income from continuing operations	91.3			91.2			258.8	227.5
Income (loss) from discontinued operations, net of tax	0.0			0.0			0.0	0.0
Discontinued Operation, Income (Loss) From Investment In Subsidiaries	1.0			18.9			(0.9)	27.0
Net income	92.3			110.1			257.9	254.5
Comprehensive income, net of tax
Changes in cumulative translation adjustment	(25.8)			(2.1)			(28.3)	23.1
Changes in market value of derivative financial instruments, net of tax	21.9			(1.0)			22.8	(0.7)
Comprehensive income	88.4			107.0			252.4	276.9
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales	0.0			0.0			0.0	0.0
Cost of goods sold	0.0			0.0			0.0	0.0
Gross profit	0.0			0.0			0.0	0.0
Selling, general and administrative expenses	(0.2)			0.0			0.1	0.0
Research and development expenses	0.0			0.0			0.0	0.0
Segment income	0.2			0.0			(0.1)	0.0
(Earnings) loss from continuing operations of investment in subsidiaries	(101.0)			(93.3)			(276.5)	(239.4)
Other (income) expense:
Loss on sale of business	0.0			0.0			0.0	0.0
Loss on early extinguishment of debt								0.0
Net interest expense	0.0			(0.2)			2.0	(1.0)
Other Income	0.0			0.0			0.0	0.0
Income from continuing operations before income taxes	101.2			93.5			274.4	240.4
Provision for income taxes	0.0			0.0			0.0	0.0
Net income from continuing operations	101.2			93.5			274.4	240.4
Income (loss) from discontinued operations, net of tax	0.0			0.0			0.0	0.0
Discontinued Operation, Income (Loss) From Investment In Subsidiaries	1.0			18.9			(0.9)	27.0
Net income	102.2			112.4			273.5	267.4
Comprehensive income, net of tax
Changes in cumulative translation adjustment	(25.8)			(2.1)			(28.3)	23.1
Changes in market value of derivative financial instruments, net of tax	21.9			(1.0)			22.8	(0.7)
Comprehensive income	98.3			109.3			268.0	289.8
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Net sales	0.0			0.0			0.0	0.0
Cost of goods sold	0.0			0.0			0.0	0.0
Gross profit	0.0			0.0			0.0	0.0
Selling, general and administrative expenses	0.4			0.2			1.1	0.7
Research and development expenses	0.0			0.0			0.0	0.0
Segment income	(0.4)			(0.2)			(1.1)	(0.7)
(Earnings) loss from continuing operations of investment in subsidiaries	(103.9)			(69.5)			(280.8)	(278.9)
Other (income) expense:
Loss on sale of business	0.0			0.0			0.0	0.0
Loss on early extinguishment of debt								17.1
Net interest expense	2.5			1.7			3.2	21.7
Other Income	0.0			0.0			0.0	0.0
Income from continuing operations before income taxes	101.0			67.6			276.5	239.4
Provision for income taxes	0.0			0.0			0.0	0.0
Net income from continuing operations	101.0			67.6			276.5	239.4
Income (loss) from discontinued operations, net of tax	0.0			0.0			0.0	0.0
Discontinued Operation, Income (Loss) From Investment In Subsidiaries	1.0			18.9			(0.9)	27.0
Net income	102.0			86.5			275.6	266.4
Comprehensive income, net of tax
Changes in cumulative translation adjustment	(25.8)			(2.1)			(28.3)	23.1
Changes in market value of derivative financial instruments, net of tax	21.9			(1.0)			22.8	(0.7)
Comprehensive income	98.1			83.4			270.1	288.8
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales	713.6			711.4			2,202.0	2,224.6
Cost of goods sold	458.6			467.6			1,424.7	1,444.9
Gross profit	255.0			243.8			777.3	779.7
Selling, general and administrative expenses	116.3			113.8			389.1	387.9
Research and development expenses	19.8			19.1			61.2	57.0
Segment income	118.9			110.9			327.0	334.8
(Earnings) loss from continuing operations of investment in subsidiaries	0.0			0.0			0.0	0.0
Other (income) expense:
Loss on sale of business	0.1			0.2			(3.3)	6.4
Loss on early extinguishment of debt								0.0
Net interest expense	4.4			2.8			18.4	7.2
Other Income	0.6			2.1			(11.7)	(1.7)
Income from continuing operations before income taxes	113.8			105.8			323.6	322.9
Provision for income taxes	9.9			10.6			42.8	44.0
Net income from continuing operations	103.9			95.2			280.8	278.9
Income (loss) from discontinued operations, net of tax	1.0			18.9			(0.9)	27.0
Discontinued Operation, Income (Loss) From Investment In Subsidiaries	0.0			0.0			0.0	0.0
Net income	104.9			114.1			279.9	305.9
Comprehensive income, net of tax
Changes in cumulative translation adjustment	(25.8)			(2.1)			(28.3)	23.1
Changes in market value of derivative financial instruments, net of tax	21.9			(1.0)			22.8	(0.7)
Comprehensive income	101.0			111.0			274.4	328.3
Consolidation, Eliminations
Condensed Financial Statements, Captions [Line Items]
Net sales	0.0			0.0			0.0	0.0
Cost of goods sold	0.0			0.0			0.0	0.0
Gross profit	0.0			0.0			0.0	0.0
Selling, general and administrative expenses	0.0			0.0			0.0	0.0
Research and development expenses	0.0			0.0			0.0	0.0
Segment income	0.0			0.0			0.0	0.0
(Earnings) loss from continuing operations of investment in subsidiaries	306.1			256.3			831.7	758.7
Other (income) expense:
Loss on sale of business	0.0			0.0			0.0	0.0
Loss on early extinguishment of debt								0.0
Net interest expense	0.0			0.0			0.0	0.0
Other Income	0.0			0.0			0.0	0.0
Income from continuing operations before income taxes	(306.1)			(256.3)			(831.7)	(758.7)
Provision for income taxes	0.0			0.0			0.0	0.0
Net income from continuing operations	(306.1)			(256.3)			(831.7)	(758.7)
Income (loss) from discontinued operations, net of tax	0.0			0.0			0.0	0.0
Discontinued Operation, Income (Loss) From Investment In Subsidiaries	(3.0)			(56.7)			2.7	(81.0)
Net income	(309.1)			(313.0)			(829.0)	(839.7)
Comprehensive income, net of tax
Changes in cumulative translation adjustment	77.4			6.3			84.9	(69.3)
Changes in market value of derivative financial instruments, net of tax	(65.7)			3.0			(68.4)	2.1
Comprehensive income	$ (297.4)			$ (303.7)			$ (812.5)	$ (906.9)