Supplemental Guarantor Information - Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Net sales	$ 799.5		$ 780.6		$ 1,488.4	$ 1,513.2
Cost of goods sold	512.8		498.0		966.1	977.3
Gross profit	286.7		282.6		522.3	535.9
Selling, general and administrative expenses	132.2		140.9		279.5	282.7
Research and development expenses	20.7		19.1		41.4	37.9
Operating income	133.8		122.6		201.4	215.3
(Earnings) loss from continuing operations of investment in subsidiaries			0.0		0.0
Other (income) expense:
Loss on sale of business	0.1		0.9		(3.4)	6.2
Loss on early extinguishment of debt	0.0		(17.1)		0.0	(17.1)
Net interest (income) expense	9.4		10.1		16.7	23.6
Other Income	(12.9)		(4.2)		(12.3)	(3.8)
Income from continuing operations before income taxes	137.2		98.7		200.4	172.2
Provision for income taxes	22.1		20.8		32.9	35.9
Net income from continuing operations	115.1		77.9		167.5	136.3
(Loss) income from discontinued operations, net of tax	(0.8)		(36.4)		(1.9)	8.1
(Loss) earnings from discontinued operations of investment in subsidiaries			0.0		0.0
Comprehensive income, net of tax
Net income	114.3	$ 51.3	41.5	$ 102.9	165.6	144.4
Changes in cumulative translation adjustment	(0.9)		22.8		(2.5)	25.2
Changes in market value of derivative financial instruments, net of tax	(3.4)		4.1		0.9	0.3
Comprehensive income	$ 110.0		68.4		164.0	$ 169.9
Parent Company Guarantor
Condensed Financial Statements, Captions [Line Items]
Net sales			0.0		0.0
Cost of goods sold			0.0		0.0
Gross profit			0.0		0.0
Selling, general and administrative expenses			8.1		5.7
Research and development expenses			0.0		0.0
Operating income			(8.1)		(5.7)
(Earnings) loss from continuing operations of investment in subsidiaries			(88.5)		(173.2)
Other (income) expense:
Loss on sale of business			0.0		0.0
Loss on early extinguishment of debt			0.0
Net interest (income) expense			0.0		0.0
Other Income			0.0		0.0
Income from continuing operations before income taxes			80.4		167.5
Provision for income taxes			2.5		0.0
Net income from continuing operations			77.9		167.5
(Loss) income from discontinued operations, net of tax			0.0		0.0
(Loss) earnings from discontinued operations of investment in subsidiaries			(36.4)		(1.9)
Comprehensive income, net of tax
Net income			41.5		165.6
Changes in cumulative translation adjustment			22.8		(2.5)
Changes in market value of derivative financial instruments, net of tax			4.1		0.9
Comprehensive income			68.4		164.0
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales			0.0		0.0
Cost of goods sold			0.0		0.0
Gross profit			0.0		0.0
Selling, general and administrative expenses			0.0		0.2
Research and development expenses			0.0		0.0
Operating income			0.0		(0.2)
(Earnings) loss from continuing operations of investment in subsidiaries			(88.1)		(175.4)
Other (income) expense:
Loss on sale of business			0.0		0.0
Loss on early extinguishment of debt			0.0
Net interest (income) expense			(0.4)		2.0
Other Income			0.0		0.0
Income from continuing operations before income taxes			88.5		173.2
Provision for income taxes			0.0		0.0
Net income from continuing operations			88.5		173.2
(Loss) income from discontinued operations, net of tax			0.0		0.0
(Loss) earnings from discontinued operations of investment in subsidiaries			(36.4)		(1.9)
Comprehensive income, net of tax
Net income			52.1		171.3
Changes in cumulative translation adjustment			22.8		(2.5)
Changes in market value of derivative financial instruments, net of tax			4.1		0.9
Comprehensive income			79.0		169.7
Subsidiary Issuer
Condensed Financial Statements, Captions [Line Items]
Net sales			0.0		0.0
Cost of goods sold			0.0		0.0
Gross profit			0.0		0.0
Selling, general and administrative expenses			0.4		0.8
Research and development expenses			0.0		0.0
Operating income			(0.4)		(0.8)
(Earnings) loss from continuing operations of investment in subsidiaries			(138.1)		(176.8)
Other (income) expense:
Loss on sale of business			0.0		0.0
Loss on early extinguishment of debt			(17.1)
Net interest (income) expense			7.3		0.6
Other Income			0.0		0.0
Income from continuing operations before income taxes			113.3		175.4
Provision for income taxes			0.0		0.0
Net income from continuing operations			113.3		175.4
(Loss) income from discontinued operations, net of tax			0.0		0.0
(Loss) earnings from discontinued operations of investment in subsidiaries			(36.4)		(1.9)
Comprehensive income, net of tax
Net income			76.9		173.5
Changes in cumulative translation adjustment			22.8		(2.5)
Changes in market value of derivative financial instruments, net of tax			4.1		0.9
Comprehensive income			103.8		171.9
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net sales			780.6		1,488.4
Cost of goods sold			498.0		966.1
Gross profit			282.6		522.3
Selling, general and administrative expenses			132.4		272.8
Research and development expenses			19.1		41.4
Operating income			131.1		208.1
(Earnings) loss from continuing operations of investment in subsidiaries			0.0		0.0
Other (income) expense:
Loss on sale of business			0.9		(3.4)
Loss on early extinguishment of debt			0.0
Net interest (income) expense			3.2		14.1
Other Income			(4.2)		(12.3)
Income from continuing operations before income taxes			131.2		209.7
Provision for income taxes			18.3		32.9
Net income from continuing operations			112.9		176.8
(Loss) income from discontinued operations, net of tax			(36.4)		(1.9)
(Loss) earnings from discontinued operations of investment in subsidiaries			0.0		0.0
Comprehensive income, net of tax
Net income			76.5		174.9
Changes in cumulative translation adjustment			22.8		(2.5)
Changes in market value of derivative financial instruments, net of tax			4.1		0.9
Comprehensive income			103.4		173.3
Consolidation, Eliminations
Condensed Financial Statements, Captions [Line Items]
Net sales			0.0		0.0
Cost of goods sold			0.0		0.0
Gross profit			0.0		0.0
Selling, general and administrative expenses			0.0		0.0
Research and development expenses			0.0		0.0
Operating income			0.0		0.0
(Earnings) loss from continuing operations of investment in subsidiaries			314.7		525.4
Other (income) expense:
Loss on sale of business			0.0		0.0
Loss on early extinguishment of debt			0.0
Net interest (income) expense			0.0		0.0
Other Income			0.0		0.0
Income from continuing operations before income taxes			(314.7)		(525.4)
Provision for income taxes			0.0		0.0
Net income from continuing operations			(314.7)		(525.4)
(Loss) income from discontinued operations, net of tax			0.0		0.0
(Loss) earnings from discontinued operations of investment in subsidiaries			109.2		5.7
Comprehensive income, net of tax
Net income			(205.5)		(519.7)
Changes in cumulative translation adjustment			(68.4)		7.5
Changes in market value of derivative financial instruments, net of tax			(12.3)		(2.7)
Comprehensive income			$ (286.2)		$ (514.9)