Condensed Consolidated Statements of Earnings and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 272.0	$ 248.6	$ 514.1	$ 475.9
Cost of goods sold	168.6	165.9	319.3	322.4
Gross profit	103.4	82.7	194.8	153.5
Selling, general and administrative expenses	37.4	40.9	93.0	78.4
Equity earnings from joint venture	(21.2)	(24.2)	(40.1)	(40.5)
Operating income	87.2	66.0	141.9	115.6
Interest expense	9.5	9.8	19.9	19.0
Other non-operating (income), net	(5.4)	(9.1)	(10.9)	(18.1)
Earnings from continuing operations before income taxes	83.1	65.3	132.9	114.7
Income tax expense	19.4	17.7	32.8	25.9
Earnings from continuing operations	63.7	47.6	100.1	88.8
Net (loss) earnings from discontinued operations, net of tax expense of $4.8, $0.2, $4.7 and $1.7	(2.3)	5.5	(1.8)	9.4
(Loss) from disposal of discontinued businesses, net of tax expense (benefit) of $0.1, $0.1, $0.1 and ($0.3)	(6.9)	(5.8)	(4.7)	(23.1)
Net (loss) from discontinued operations	(9.2)	(0.3)	(6.5)	(13.7)
Net earnings	54.5	47.3	93.6	75.1
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	0.7	(20.8)	6.0	(14.9)
Derivative (loss) gain, net	(8.1)	2.0	(13.2)	5.8
Pension and postretirement adjustments	2.9	3.1	5.7	4.9
Total other comprehensive (loss)	(4.5)	(15.7)	(1.5)	(4.2)
Total comprehensive income	$ 50.0	$ 31.6	$ 92.1	$ 70.9
Earnings per share of common stock, continuing operations:
Basic	$ 1.30	$ 0.91	$ 2.05	$ 1.69
Diluted	1.28	0.90	2.01	1.66
(Loss) per share of common stock, discontinued operations:
Basic	(0.19)	(0.01)	(0.13)	(0.26)
Diluted	(0.19)	(0.01)	(0.13)	(0.26)
Net earnings per share of common stock:
Basic	1.11	0.90	1.92	1.43
Diluted	$ 1.09	$ 0.89	$ 1.88	$ 1.40
Average number of common shares outstanding:
Basic	49.0	51.9	48.8	52.5
Diluted	49.8	52.6	49.6	53.2