Condensed Guarantor and Non-Guarantor Financial Information, Comprehensive Income Statements (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Financial Statements, Captions
Revenues		$ 393.1	$ 332.8		$ 1,196.5	$ 1,044.4
Cost of products sold, excluding depreciation and amortization and other items1	[1]	323.3	256.4		983.4	808.7
Purchase of equity securities					(0.9)	0.0
Costs and expenses:
Depreciation and amortization		11.0	10.2		32.4	29.3
Selling, general, administrative, research and development	[2]	23.9	24.7		73.9	74.7
Goodwill impairment		0.0	0.0	$ 18.4	0.0	18.4
Other operating charges, net		0.0	0.0		0.1	0.0
Total costs and expenses		358.2	291.3		1,089.8	931.1
Operating income		34.9	41.5		106.7	113.3
Other income (expense):
Interest expense		(5.7)	(5.3)		(17.0)	(16.4)
Other (expense) income, net		0.7	(0.2)		0.3	0.5
Income before income taxes		29.9	36.0		90.0	97.4
Income tax provision		(8.2)	(16.1)		(21.9)	(36.8)
Earnings in equity of subsidiaries		0.0	0.0		0.0	0.0
Net income		21.7	19.9		68.1	60.6
Comprehensive income		20.9	21.5		65.4	64.6
Consolidating Adjustments
Condensed Financial Statements, Captions
Revenues		(26.5)	(19.4)		(75.3)	(60.7)
Cost of products sold, excluding depreciation and amortization and other items1		(26.1)	(18.4)		(73.0)	(58.1)
Purchase of equity securities					0.0
Costs and expenses:
Depreciation and amortization		0.0	0.0		0.0	0.0
Selling, general, administrative, research and development		(0.4)	(0.6)		(2.3)	(1.6)
Goodwill impairment						0.0
Other operating charges, net					0.0
Total costs and expenses		(26.5)	(19.0)		(75.3)	(59.7)
Operating income		0.0	(0.4)		0.0	(1.0)
Other income (expense):
Interest expense		0.1	0.1		0.4	0.1
Other (expense) income, net		(0.1)	(0.1)		(0.4)	(0.1)
Income before income taxes		0.0	(0.4)		0.0	(1.0)
Income tax provision		1.6	2.3		4.8	7.1
Earnings in equity of subsidiaries		(28.7)	(26.5)		(90.1)	(81.1)
Net income		(27.1)	(24.6)		(85.3)	(75.0)
Comprehensive income		(26.3)	(26.2)		(82.6)	(79.0)
Parent
Condensed Financial Statements, Captions
Revenues		0.0	0.0		0.0	0.0
Cost of products sold, excluding depreciation and amortization and other items1		0.0	0.0		0.0	0.0
Purchase of equity securities					0.0
Costs and expenses:
Depreciation and amortization		0.0	0.0		0.0	0.0
Selling, general, administrative, research and development		1.0	1.0		3.7	3.4
Goodwill impairment						0.0
Other operating charges, net					0.0
Total costs and expenses		1.0	1.0		3.7	3.4
Operating income		(1.0)	(1.0)		(3.7)	(3.4)
Other income (expense):
Interest expense		(5.4)	(5.0)		(15.9)	(15.3)
Other (expense) income, net		0.0	0.0		0.0	0.0
Income before income taxes		(6.4)	(6.0)		(19.6)	(18.7)
Income tax provision		0.0	0.0		0.0	0.0
Earnings in equity of subsidiaries		28.1	25.9		87.7	79.3
Net income		21.7	19.9		68.1	60.6
Comprehensive income		20.9	21.5		65.4	64.6
Guarantor Subsidiaries
Condensed Financial Statements, Captions
Revenues		385.9	325.9		1,168.5	1,019.7
Cost of products sold, excluding depreciation and amortization and other items1		317.9	250.8		962.9	791.8
Purchase of equity securities					(0.9)
Costs and expenses:
Depreciation and amortization		10.5	9.7		30.8	27.7
Selling, general, administrative, research and development		22.8	23.5		67.8	67.2
Goodwill impairment						18.4
Other operating charges, net					0.1
Total costs and expenses		351.2	284.0		1,061.6	905.1
Operating income		34.7	41.9		106.9	114.6
Other income (expense):
Interest expense		(0.4)	(0.4)		(1.5)	(1.2)
Other (expense) income, net		0.6	(0.4)		0.4	0.1
Income before income taxes		34.9	41.1		105.8	113.5
Income tax provision		(9.0)	(18.0)		(25.3)	(43.0)
Earnings in equity of subsidiaries		0.6	0.6		2.4	1.8
Net income		26.5	23.7		82.9	72.3
Comprehensive income		25.7	25.3		80.2	76.3
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions
Revenues		33.7	26.3		103.3	85.4
Cost of products sold, excluding depreciation and amortization and other items1		31.5	24.0		93.5	75.0
Purchase of equity securities					0.0
Costs and expenses:
Depreciation and amortization		0.5	0.5		1.6	1.6
Selling, general, administrative, research and development		0.5	0.8		4.7	5.7
Goodwill impairment						0.0
Other operating charges, net					0.0
Total costs and expenses		32.5	25.3		99.8	82.3
Operating income		1.2	1.0		3.5	3.1
Other income (expense):
Interest expense		0.0	0.0		0.0	0.0
Other (expense) income, net		0.2	0.3		0.3	0.5
Income before income taxes		1.4	1.3		3.8	3.6
Income tax provision		(0.8)	(0.4)		(1.4)	(0.9)
Earnings in equity of subsidiaries		0.0	0.0		0.0	0.0
Net income		0.6	0.9		2.4	2.7
Comprehensive income		$ 0.6	$ 0.9		$ 2.4	$ 2.7

[1] See Note 5 for discussion of our adoption of ASU 2017-12 (as defined in Note 1) and the related reclassification of amounts previously presented in the Statements of Consolidated Income within Unrealized (gain) loss on derivative instruments and now included within Cost of products sold, excluding depreciation and amortization and other items.

[2] See Note 1 for discussion of our adoption of ASU 2017-07 (as defined in Note 1) and the related reclassification of amounts previously presented in the Statements of Consolidated Income within Selling, general, administrative, research and development and now included within Other income (expense).