Condensed Guarantor and Non-Guarantor Financial Information, Comprehensive Income Statements (Details) - 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 CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	$ 375.3		$ 415.4		$ 770.5	$ 803.4
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	303.5		343.4		618.6	660.1
Depreciation and amortization	12.1		10.9		24.0	21.4
Selling, general, administrative, research and development	27.2		26.4		52.4	50.0
Other operating charges, net	0.1		0.0		0.1	0.1
Total costs and expenses	342.9		380.7		695.1	731.6
Operating income	32.4		34.7		75.4	71.8
Other (expense) income:
Interest expense	(5.8)		(5.7)		(11.5)	(11.3)
Other expense, net	(0.1)		(0.5)		0.4	(0.4)
Income before income taxes	26.5		28.5		64.3	60.1
Income tax provision	(7.3)		(7.8)		(17.1)	(13.7)
Earnings in equity of subsidiaries	0.0		0.0		0.0	0.0
Net income	19.2	$ 28.0	20.7	$ 25.7	47.2	46.4
Comprehensive income	16.0		27.1		53.7	44.5
Consolidating Adjustments
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	(15.3)		(26.4)		(34.7)	(48.8)
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	(15.0)		(25.1)		(33.9)	(46.9)
Depreciation and amortization	0.0		0.0		0.0	0.0
Selling, general, administrative, research and development	(0.3)		(1.2)		(0.8)	(1.9)
Other operating charges, net	0.0				0.0	0.0
Total costs and expenses	(15.3)		(26.3)		(34.7)	(48.8)
Operating income	0.0		(0.1)		0.0	0.0
Other (expense) income:
Interest expense	0.1		0.2		0.2	0.3
Other expense, net	(0.1)		(0.2)		(0.2)	(0.3)
Income before income taxes	0.0		(0.1)		0.0	0.0
Income tax provision	1.7		1.7		3.2	3.2
Earnings in equity of subsidiaries	(25.8)		(28.7)		(60.6)	(61.4)
Net income	(24.1)		(27.1)		(57.4)	(58.2)
Comprehensive income	(20.9)		(33.5)		(63.9)	(56.3)
Parent
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	0.0		0.0		0.0	0.0
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	0.0		0.0		0.0	0.0
Depreciation and amortization	0.0		0.0		0.0	0.0
Selling, general, administrative, research and development	1.4		1.6		2.5	2.7
Other operating charges, net	0.0				0.0	0.0
Total costs and expenses	1.4		1.6		2.5	2.7
Operating income	(1.4)		(1.6)		(2.5)	(2.7)
Other (expense) income:
Interest expense	(5.4)		(5.3)		(10.6)	(10.5)
Other expense, net	0.0		0.0		0.0	0.0
Income before income taxes	(6.8)		(6.9)		(13.1)	(13.2)
Income tax provision	0.0		0.0		0.0	0.0
Earnings in equity of subsidiaries	26.0		27.6		60.3	59.6
Net income	19.2		20.7		47.2	46.4
Comprehensive income	16.0		27.1		53.7	44.5
Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	366.9		404.7		752.6	782.6
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	296.0		335.6		605.0	645.0
Depreciation and amortization	11.1		10.4		22.0	20.3
Selling, general, administrative, research and development	25.6		23.7		47.8	45.0
Other operating charges, net	0.1				0.1	0.1
Total costs and expenses	332.8		369.7		674.9	710.4
Operating income	34.1		35.0		77.7	72.2
Other (expense) income:
Interest expense	(0.5)		(0.6)		(1.1)	(1.1)
Other expense, net	(0.1)		(0.3)		0.2	(0.2)
Income before income taxes	33.5		34.1		76.8	70.9
Income tax provision	(9.0)		(9.2)		(20.0)	(16.3)
Earnings in equity of subsidiaries	(0.2)		1.1		0.3	1.8
Net income	24.3		26.0		57.1	56.4
Comprehensive income	21.1		32.4		63.6	54.5
Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	23.7		37.1		52.6	69.6
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	22.5		32.9		47.5	62.0
Depreciation and amortization	1.0		0.5		2.0	1.1
Selling, general, administrative, research and development	0.5		2.3		2.9	4.2
Other operating charges, net	0.0				0.0	0.0
Total costs and expenses	24.0		35.7		52.4	67.3
Operating income	(0.3)		1.4		0.2	2.3
Other (expense) income:
Interest expense	0.0		0.0		0.0	0.0
Other expense, net	0.1		0.0		0.4	0.1
Income before income taxes	(0.2)		1.4		0.6	2.4
Income tax provision	0.0		(0.3)		(0.3)	(0.6)
Earnings in equity of subsidiaries	0.0		0.0		0.0	0.0
Net income	(0.2)		1.1		0.3	1.8
Comprehensive income	$ (0.2)		$ 1.1		$ 0.3	$ 1.8