Condensed Consolidated Statements of Earnings and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net sales	$ 227.3	$ 219.8
Cost of goods sold	156.5	141.5
Gross profit	70.8	78.3
Selling, general and administrative expenses	37.5	39.3
Equity earnings from joint venture	(16.3)	(18.3)
Operating income	49.6	57.3
Interest expense	9.2	8.9
Other non-operating (income), net	(9.0)	(8.9)
Earnings from continuing operations before income taxes	49.4	57.3
Income tax expense	8.2	21.8
Earnings from continuing operations	41.2	35.5
Net earnings (loss) from discontinued operations, net of tax expense of $1.5 and $2.8	3.9	(4.7)
(Loss) from disposal of discontinued business, net of tax (benefit) expense of ($0.4) and $0.3	(17.3)	(0.4)
Net (loss) from discontinued operations	(13.4)	(5.1)
Net earnings	27.8	30.4
Other comprehensive income, net of tax:
Foreign currency translation adjustments	5.9	11.1
Derivative gain, net	3.8	0.1
Pension and postretirement adjustments	1.8	2.5
Total other comprehensive income	11.5	13.7
Total comprehensive income	$ 39.3	$ 44.1
Earnings per share of common stock, continuing operations:
Basic	$ 0.78	$ 0.65
Diluted	0.76	0.65
(Loss) per share of common stock, discontinued operations:
Basic	(0.25)	(0.09)
Diluted	(0.25)	(0.09)
Net earnings per share of common stock:
Basic	0.53	0.56
Diluted	$ 0.51	$ 0.56
Average number of common shares outstanding:
Basic	53.0	54.1
Diluted	53.8	54.5