Condensed Guarantor and Non-Guarantor Financial Information, Comprehensive Income Statements (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Financial Statements, Captions
Purchase of equity securities				$ (0.9)	$ 0.0
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales		$ 415.4	$ 356.3	803.4	711.6
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items	[1]	343.4	289.6	660.1	552.3
Depreciation and amortization		10.9	9.5	21.4	19.1
Selling, general, administrative, research and development	[2]	26.4	26.3	50.0	50.0
Goodwill impairment		0.0	18.4	0.0	18.4
Other operating charges, net		0.0	0.0	0.1	0.0
Total costs and expenses		380.7	343.8	731.6	639.8
Operating income		34.7	12.5	71.8	71.8
Other (expense) income:
Interest expense		(5.7)	(5.5)	(11.3)	(11.1)
Other (expense) income, net		(0.5)	(0.1)	(0.4)	0.7
Income before income taxes		28.5	6.9	60.1	61.4
Income tax provision		(7.8)	(2.2)	(13.7)	(20.7)
Earnings in equity of subsidiaries		0.0	0.0	0.0	0.0
Net income		20.7	4.7	46.4	40.7
Comprehensive income		27.1	5.8	44.5	43.1
Consolidating Adjustments
Condensed Financial Statements, Captions
Purchase of equity securities				0.0
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales		(26.4)	(20.5)	(48.8)	(41.3)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items		(25.1)	(19.6)	(46.9)	(39.7)
Depreciation and amortization		0.0	0.0	0.0	0.0
Selling, general, administrative, research and development		(1.2)	(0.5)	(1.9)	(1.0)
Goodwill impairment			0.0		0.0
Other operating charges, net				0.0
Total costs and expenses		(26.3)	(20.1)	(48.8)	(40.7)
Operating income		(0.1)	(0.4)	0.0	(0.6)
Other (expense) income:
Interest expense		0.2	0.0	0.3	0.0
Other (expense) income, net		(0.2)	0.0	(0.3)	0.0
Income before income taxes		(0.1)	(0.4)	0.0	(0.6)
Income tax provision		1.7	2.3	3.2	4.8
Earnings in equity of subsidiaries		(28.7)	(11.4)	(61.4)	(54.6)
Net income		(27.1)	(9.5)	(58.2)	(50.4)
Comprehensive income		(33.5)	(10.6)	(56.3)	(52.8)
Parent
Condensed Financial Statements, Captions
Purchase of equity securities				0.0
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales		0.0	0.0	0.0	0.0
Cost of products sold:
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		1.6	1.5	2.7	2.4
Goodwill impairment			0.0		0.0
Other operating charges, net				0.0
Total costs and expenses		1.6	1.5	2.7	2.4
Operating income		(1.6)	(1.5)	(2.7)	(2.4)
Other (expense) income:
Interest expense		(5.3)	(4.6)	(10.5)	(10.3)
Other (expense) income, net		0.0	0.0	0.0	0.0
Income before income taxes		(6.9)	(6.1)	(13.2)	(12.7)
Income tax provision		0.0	0.0	0.0	0.0
Earnings in equity of subsidiaries		27.6	10.8	59.6	53.4
Net income		20.7	4.7	46.4	40.7
Comprehensive income		27.1	5.8	44.5	43.1
Guarantor Subsidiaries
Condensed Financial Statements, Captions
Purchase of equity securities				(0.9)
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales		404.7	347.0	782.6	693.8
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items		335.6	283.5	645.0	541.0
Depreciation and amortization		10.4	9.0	20.3	18.0
Selling, general, administrative, research and development		23.7	22.8	45.0	43.7
Goodwill impairment			18.4		18.4
Other operating charges, net				0.1
Total costs and expenses		369.7	333.7	710.4	621.1
Operating income		35.0	13.3	72.2	72.7
Other (expense) income:
Interest expense		(0.6)	(0.9)	(1.1)	(0.8)
Other (expense) income, net		(0.3)	(0.3)	(0.2)	0.5
Income before income taxes		34.1	12.1	70.9	72.4
Income tax provision		(9.2)	(4.2)	(16.3)	(25.0)
Earnings in equity of subsidiaries		1.1	0.6	1.8	1.2
Net income		26.0	8.5	56.4	48.6
Comprehensive income		32.4	9.6	54.5	51.0
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions
Purchase of equity securities				0.0
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales		37.1	29.8	69.6	59.1
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items		32.9	25.7	62.0	51.0
Depreciation and amortization		0.5	0.5	1.1	1.1
Selling, general, administrative, research and development		2.3	2.5	4.2	4.9
Goodwill impairment			0.0		0.0
Other operating charges, net				0.0
Total costs and expenses		35.7	28.7	67.3	57.0
Operating income		1.4	1.1	2.3	2.1
Other (expense) income:
Interest expense		0.0	0.0	0.0	0.0
Other (expense) income, net		0.0	0.2	0.1	0.2
Income before income taxes		1.4	1.3	2.4	2.3
Income tax provision		(0.3)	(0.3)	(0.6)	(0.5)
Earnings in equity of subsidiaries		0.0	0.0	0.0	0.0
Net income		1.1	1.0	1.8	1.8
Comprehensive income		$ 1.1	$ 1.0	$ 1.8	$ 1.8

[1] See Note 4 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 loss (gain) 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 (expense) income.