Consolidated Statements of Earnings and Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net sales	$ 975.3	$ 893.6	$ 837.3
Cost of goods sold	641.8	578.2	530.3
Gross profit	333.5	315.4	307.0
Selling, general and administrative expenses	159.0	138.6	184.2
Equity earnings from joint venture	(74.9)	(67.0)	(73.1)
Operating income	249.4	243.8	195.9
Interest expense	39.2	35.4	49.5
Other non-operating (income) expense, net	(32.5)	(13.7)	(4.2)
Earnings from continuing operations before income taxes	242.7	222.1	150.6
Income tax expense	53.1	1.5	51.3
Earnings from continuing operations	189.6	220.6	99.3
Net gain (loss) from discontinued operations, net of tax expense (benefit) of $8.2, $3.6 and ($0.8)	9.6	4.2	(9.9)
(Loss) gain on disposal of discontinued business, net of tax (benefit) of ($6.0), ($4.1) and ($15.2)	(13.3)	(70.0)	15.3
Net (loss) gain from discontinued operations	(3.7)	(65.8)	5.4
Net earnings	185.9	154.8	104.7
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(27.6)	24.5	(33.2)
Derivative gain (loss)	1.1	(0.3)	7.5
Pension and postretirement adjustments	(32.9)	33.7	49.3
Total other comprehensive (loss) income	(59.4)	57.9	23.6
Total comprehensive income	$ 126.5	$ 212.7	$ 128.3
Earnings per share of common stock, continuing operations:
Basic	$ 3.68	$ 4.12	$ 1.79
Diluted	3.63	4.08	1.78
(Loss) earnings per share of common stock, discontinued operations:
Basic	(0.07)	(1.23)	0.09
Diluted	(0.07)	(1.22)	0.09
Net earnings per share of common stock:
Basic	3.61	2.89	1.88
Diluted	$ 3.56	$ 2.86	$ 1.87
Average number of common shares outstanding:
Basic	51.3	53.3	55.4
Diluted	52.1	53.9	55.7