Discontinued Operations and Special Charges (Gains) - Reconciliation of Pretax Loss on Discontinued Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 0.0	$ 143.0
Cost of sales	0.0	118.8
Gross profit	0.0	24.2
Selling, distribution & administrative expenses	0.4	15.6
Special charges	0.1	(0.7)
Operating (loss) income from discontinued operations	(0.5)	9.3
Interest and other (income) expenses, net	0.0	(0.2)
Income (loss) from discontinued operations before income taxes	(0.5)	9.5
(Benefit from) provision for income taxes	(0.2)	3.6
Net income (loss) from discontinued operations	$ (0.3)	$ 5.9
Net income (loss) per share – basic (in dollars per share)	$ (0.01)	$ 0.16
Net income (loss) per share – diluted (in dollars per share)	$ (0.01)	$ 0.15