Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 330.8	$ 314.3	$ 646.2	$ 601.7
Cost of goods sold	219.7	222.8	435.8	425.9
Gross profit	111.1	91.5	210.4	175.8
Selling, general and administrative expenses	52.4	55.8	107.0	109.5
Separation costs		3.9		31.0
Equity earnings from joint venture	(19.7)	(19.9)	(38.0)	(38.0)
Operating income	78.4	51.7	141.4	73.3
Interest expense	9.2	12.5	18.4	34.4
Other non-operating expense	0.1		1.9
Other non-operating (income)	(1.0)	(2.1)	(4.4)	(7.3)
Earnings from continuing operations before income taxes	70.1	41.3	125.5	46.2
Income tax expense	28.6	24.7	53.2	36.7
Earnings from continuing operations	41.5	16.6	72.3	9.5
Net (loss) from discontinued operations, net of tax expense of $ -, $-, $- and $ 0.1				(4.5)
(Loss) gain from disposal of discontinued business, net of tax expense (benefit) of $0.2, ($0.1), $0.5 and ($1.9)	(0.2)	0.3	(0.6)	2.0
Net (loss) gain from discontinued operations	(0.2)	0.3	(0.6)	(2.5)
Net earnings	41.3	16.9	71.7	7.0
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	2.8	(13.2)	13.9	(11.8)
Derivative (loss)	(1.8)	(2.1)	(1.7)	(0.5)
Pension and postretirement adjustments	2.0	9.2	4.5	17.0
Total other comprehensive income (loss)	3.0	(6.1)	16.7	4.7
Total comprehensive income	$ 44.3	$ 10.8	$ 88.4	$ 11.7
Earnings per share of common stock, continuing operations:
Basic	$ 0.78	$ 0.30	$ 1.34	$ 0.17
Diluted	0.77	0.29	1.33	0.17
Earnings (loss) per share of common stock, discontinued operations:
Basic		0.01	(0.01)	(0.04)
Diluted		0.01	(0.01)	(0.04)
Net earnings per share of common stock:
Basic	0.77	0.30	1.33	0.13
Diluted	$ 0.77	$ 0.30	$ 1.32	$ 0.13
Average number of common shares outstanding:
Basic	53.3	55.6	53.7	55.6
Diluted	53.7	56.0	54.1	55.9