Condensed Guarantor and Non-Guarantor Financial Information, Comprehensive Income Statements (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales		$ 388.0	$ 355.3
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items1	[1]	316.7	262.7
Depreciation and amortization		10.5	9.6
Selling, general, administrative, research and development	[2]	23.6	23.7
Other operating charges, net		0.1	0.0
Total costs and expenses		350.9	296.0
Operating Income (Loss)		37.1	59.3
Other (expense) income:
Interest (expense) income		(5.6)	(5.6)
Other income, net		0.1	0.8
Income before income taxes		31.6	54.5
Income tax provision		(5.9)	(18.5)
Earnings in equity of subsidiaries		0.0	0.0
Net income		25.7	36.0
Comprehensive income		17.4	37.3
Consolidating Adjustments
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales		(22.4)	(20.8)
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items1		(21.8)	(20.1)
Depreciation and amortization		0.0	0.0
Selling, general, administrative, research and development		(0.7)	(0.5)
Other operating charges, net		0.0
Total costs and expenses		(22.5)	(20.6)
Operating Income (Loss)		0.1	(0.2)
Other (expense) income:
Interest (expense) income		0.1	0.0
Other income, net		(0.1)	0.0
Income before income taxes		0.1	(0.2)
Income tax provision		1.5	2.5
Earnings in equity of subsidiaries		(32.7)	(43.2)
Net income		(31.1)	(40.9)
Comprehensive income		(22.8)	(42.2)
Parent
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales		0.0	0.0
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items1		0.0	0.0
Depreciation and amortization		0.0	0.0
Selling, general, administrative, research and development		1.1	0.9
Other operating charges, net		0.0
Total costs and expenses		1.1	0.9
Operating Income (Loss)		(1.1)	(0.9)
Other (expense) income:
Interest (expense) income		(5.2)	(5.7)
Other income, net		0.0	0.0
Income before income taxes		(6.3)	(6.6)
Income tax provision		0.0	0.0
Earnings in equity of subsidiaries		32.0	42.6
Net income		25.7	36.0
Comprehensive income		17.4	37.3
Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales		377.9	346.8
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items1		309.4	257.5
Depreciation and amortization		9.9	9.0
Selling, general, administrative, research and development		21.3	20.9
Other operating charges, net		0.1
Total costs and expenses		340.7	287.4
Operating Income (Loss)		37.2	59.4
Other (expense) income:
Interest (expense) income		(0.5)	0.1
Other income, net		0.1	0.8
Income before income taxes		36.8	60.3
Income tax provision		(7.1)	(20.8)
Earnings in equity of subsidiaries		0.7	0.6
Net income		30.4	40.1
Comprehensive income		22.1	41.4
Non-Guarantor Subsidiaries
CONDENSED CONSOLIDATING STATEMENT OF COMPREHENSIVE INCOME
Net sales		32.5	29.3
Cost of products sold:
Cost of products sold, excluding depreciation and amortization and other items1		29.1	25.3
Depreciation and amortization		0.6	0.6
Selling, general, administrative, research and development		1.9	2.4
Other operating charges, net		0.0
Total costs and expenses		31.6	28.3
Operating Income (Loss)		0.9	1.0
Other (expense) income:
Interest (expense) income		0.0	0.0
Other income, net		0.1	0.0
Income before income taxes		1.0	1.0
Income tax provision		(0.3)	(0.2)
Earnings in equity of subsidiaries		0.0	0.0
Net income		0.7	0.8
Comprehensive income		$ 0.7	$ 0.8

[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 (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 (expense) income.