Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 248.7	$ 242.1
Cost of goods sold	157.4	150.7
Gross profit	91.3	91.4
Selling, general and administrative expenses	34.8	55.6
Equity earnings from joint venture	(19.5)	(18.9)
Operating income	76.0	54.7
Interest expense	6.7	10.4
Other non-operating expense (income), net	369.4	(5.5)
(Loss) earnings from continuing operations before income taxes	(300.1)	49.8
Income tax (benefit) expense	(77.5)	13.4
(Loss) earnings from continuing operations	(222.6)	36.4
Net earnings from discontinued operations, net of tax (benefit) of $- and ($0.1)		0.5
(Loss) gain from disposal of discontinued businesses, net of tax (benefit) of ($1.4) and $-	(3.6)	2.2
Net (loss) gain from discontinued operations	(3.6)	2.7
Net (loss) earnings	(226.2)	39.1
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(2.1)	5.3
Derivative (loss), net	(11.8)	(5.1)
Pension and postretirement adjustments	288.3	2.8
Total other comprehensive income	274.4	3.0
Total comprehensive income	$ 48.2	$ 42.1
(Loss) earnings per share of common stock, continuing operations:
Basic	$ (4.64)	$ 0.75
Diluted	(4.64)	0.73
(Loss) earnings per share of common stock, discontinued operations:
Basic	(0.07)	0.05
Diluted	(0.07)	0.05
Net (loss) earnings per share of common stock:
Basic	(4.71)	0.80
Diluted	$ (4.71)	$ 0.78
Average number of common shares outstanding:
Basic	48.0	48.7
Diluted	48.0	49.5