Condensed Consolidated Statements of Earnings and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 248.6	$ 225.6	$ 475.9	$ 445.4
Cost of goods sold	165.9	140.4	322.4	281.9
Gross profit	82.7	85.2	153.5	163.5
Selling, general and administrative expenses	40.9	35.7	78.4	75.0
Equity earnings from joint venture	(24.2)	(19.7)	(40.5)	(38.0)
Operating income	66.0	69.2	115.6	126.5
Interest expense	9.8	8.9	19.0	17.8
Other non-operating (income), net	(9.1)	(8.3)	(18.1)	(17.2)
Earnings from continuing operations before income taxes	65.3	68.6	114.7	125.9
Income tax expense	17.7	24.9	25.9	46.7
Earnings from continuing operations	47.6	43.7	88.8	79.2
Net earnings (loss) from discontinued operations, net of tax expense of $0.2, $3.7, $1.7 and $6.5	5.5	(2.2)	9.4	(6.9)
(Loss) from disposal of discontinued business, net of tax expense (benefit) of $0.1, $0.2, ($0.3) and $0.5	(5.8)	(0.2)	(23.1)	(0.6)
Net (loss) from discontinued operations	(0.3)	(2.4)	(13.7)	(7.5)
Net earnings	47.3	41.3	75.1	71.7
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(20.8)	2.8	(14.9)	13.9
Derivative gain (loss), net	2.0	(1.8)	5.8	(1.7)
Pension and postretirement adjustments	3.1	2.0	4.9	4.5
Total other comprehensive (loss) income	(15.7)	3.0	(4.2)	16.7
Total comprehensive income	$ 31.6	$ 44.3	$ 70.9	$ 88.4
Earnings per share of common stock, continuing operations:
Basic	$ 0.91	$ 0.82	$ 1.69	$ 1.47
Diluted	0.90	0.81	1.66	1.46
(Loss) per share of common stock, discontinued operations:
Basic	(0.01)	(0.05)	(0.26)	(0.14)
Diluted	(0.01)	(0.04)	(0.26)	(0.14)
Net earnings per share of common stock:
Basic	0.90	0.77	1.43	1.33
Diluted	$ 0.89	$ 0.77	$ 1.40	$ 1.32
Average number of common shares outstanding:
Basic	51.9	53.3	52.5	53.7
Diluted	52.6	53.7	53.2	54.1