Condensed Guarantor and Non-Guarantor Financial Information, Comprehensive Income Statements (Details) - 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 CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	$ 374.9			$ 393.1			$ 1,145.4	$ 1,196.5
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	298.6			323.3			917.2	983.4
Depreciation and amortization	12.3			11.0			36.3	32.4
Selling, general, administrative, research and development	23.3			23.9			75.7	73.9
Other operating charges, net	0.0			0.0			0.1	0.1
Total costs and expenses	334.2			358.2			1,029.3	1,089.8
Operating income	40.7			34.9			116.1	106.7
Other (expense) income:
Interest expense	(5.8)			(5.7)			(17.3)	(17.0)
Other income, net	(0.8)			0.7			(0.4)	0.3
Income before income taxes	34.1			29.9			98.4	90.0
Income tax provision	(8.7)			(8.2)			(25.8)	(21.9)
Earnings in equity of subsidiaries	0.0			0.0			0.0	0.0
Net income	25.4	$ 19.2	$ 28.0	21.7	$ 20.7	$ 25.7	72.6	68.1
Comprehensive income	24.5			20.9			78.2	65.4
Consolidating Adjustments
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	(15.9)			(26.5)			(50.6)	(75.3)
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	(15.5)			(26.1)			(49.4)	(73.0)
Depreciation and amortization	0.0			0.0			0.0	0.0
Selling, general, administrative, research and development	(0.4)			(0.4)			(1.2)	(2.3)
Other operating charges, net							0.0	0.0
Total costs and expenses	(15.9)			(26.5)			(50.6)	(75.3)
Operating income	0.0			0.0			0.0	0.0
Other (expense) income:
Interest expense	0.1			0.1			0.3	0.4
Other income, net	(0.1)			(0.1)			(0.3)	(0.4)
Income before income taxes	0.0			0.0			0.0	0.0
Income tax provision	1.7			1.6			4.9	4.8
Earnings in equity of subsidiaries	(33.2)			(28.7)			(93.8)	(90.1)
Net income	(31.5)			(27.1)			(88.9)	(85.3)
Comprehensive income	(30.6)			(26.3)			(94.5)	(82.6)
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	1.5			1.0			4.0	3.7
Other operating charges, net							0.0	0.0
Total costs and expenses	1.5			1.0			4.0	3.7
Operating income	(1.5)			(1.0)			(4.0)	(3.7)
Other (expense) income:
Interest expense	(5.3)			(5.4)			(15.9)	(15.9)
Other income, net	0.0			0.0			0.0	0.0
Income before income taxes	(6.8)			(6.4)			(19.9)	(19.6)
Income tax provision	0.0			0.0			0.0	0.0
Earnings in equity of subsidiaries	32.2			28.1			92.5	87.7
Net income	25.4			21.7			72.6	68.1
Comprehensive income	24.5			20.9			78.2	65.4
Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	365.2			385.9			1,117.8	1,168.5
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	293.4			317.9			898.4	962.9
Depreciation and amortization	11.3			10.5			33.3	30.8
Selling, general, administrative, research and development	19.6			22.8			67.4	67.8
Other operating charges, net							0.1	0.1
Total costs and expenses	324.3			351.2			999.2	1,061.6
Operating income	40.9			34.7			118.6	106.9
Other (expense) income:
Interest expense	(0.6)			(0.4)			(1.7)	(1.5)
Other income, net	(0.8)			0.6			(0.6)	0.4
Income before income taxes	39.5			34.9			116.3	105.8
Income tax provision	(10.0)			(9.0)			(30.0)	(25.3)
Earnings in equity of subsidiaries	1.0			0.6			1.3	2.4
Net income	30.5			26.5			87.6	82.9
Comprehensive income	29.6			25.7			93.2	80.2
Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales	25.6			33.7			78.2	103.3
Costs and expenses:
Cost of products sold, excluding depreciation and amortization and other items	20.7			31.5			68.2	93.5
Depreciation and amortization	1.0			0.5			3.0	1.6
Selling, general, administrative, research and development	2.6			0.5			5.5	4.7
Other operating charges, net							0.0	0.0
Total costs and expenses	24.3			32.5			76.7	99.8
Operating income	1.3			1.2			1.5	3.5
Other (expense) income:
Interest expense	0.0			0.0			0.0	0.0
Other income, net	0.1			0.2			0.5	0.3
Income before income taxes	1.4			1.4			2.0	3.8
Income tax provision	(0.4)			(0.8)			(0.7)	(1.4)
Earnings in equity of subsidiaries	0.0			0.0			0.0	0.0
Net income	1.0			0.6			1.3	2.4
Comprehensive income	$ 1.0			$ 0.6			$ 1.3	$ 2.4