Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Net sales	$ 351.9	$ 334.9	$ 998.1	$ 936.6
Cost of goods sold	241.0	225.2	676.8	651.1
Gross profit	110.9	109.7	321.3	285.5
Selling, general and administrative expenses	55.8	55.7	162.8	165.2
Separation costs		2.0		33.0
Equity earnings from joint venture	(13.9)	(19.0)	(51.9)	(57.0)
Operating income	69.0	71.0	210.4	144.3
Interest expense	9.1	9.0	27.5	43.4
Other non-operating expense	1.7		3.6
Other non-operating (income)	(3.0)	(1.6)	(7.4)	(8.9)
Earnings from continuing operations before income taxes	61.2	63.6	186.7	109.8
Income tax expense	17.7	7.7	70.9	44.4
Earnings from continuing operations	43.5	55.9	115.8	65.4
Net (loss) from discontinued operations, net of tax expense of $ -, $-, $- and $ 0.1				(4.5)
Gain from disposal of discontinued business, net of tax (benefit) of ($5.9), ($14.7), ($5.4) and ($16.6)	5.9	14.7	5.3	16.7
Net gain from discontinued operations	5.9	14.7	5.3	12.2
Net earnings	49.4	70.6	121.1	77.6
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	7.0	(2.0)	20.9	(13.8)
Derivative (loss) gain	(0.3)	1.7	(2.0)	1.2
Pension and postretirement adjustments	14.3	6.9	18.8	23.9
Total other comprehensive income	21.0	6.6	37.7	11.3
Total comprehensive income	$ 70.4	$ 77.2	$ 158.8	$ 88.9
Earnings per share of common stock, continuing operations:
Basic	$ 0.82	$ 1.00	$ 2.16	$ 1.17
Diluted	0.81	0.99	2.14	1.16
Earnings per share of common stock, discontinued operations:
Basic	0.11	0.26	0.10	0.22
Diluted	0.11	0.26	0.10	0.22
Net earnings per share of common stock:
Basic	0.93	1.27	2.26	1.39
Diluted	$ 0.92	$ 1.26	$ 2.24	$ 1.38
Average number of common shares outstanding:
Basic	53.0	55.5	53.5	55.6
Diluted	53.5	56.0	53.9	56.0