Acquisitions and Discontinued Operations - Components of Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Combination And Disposal Groups, Including Discontinued Operations, Disclosure [Abstract]
Net sales	$ 0.0	$ 693.9	$ 2,548.2
Cost of goods sold	0.0	424.0	1,596.2
Gross profit	0.0	269.9	952.0
Selling, general and administrative	7.4	237.8	589.2
Research and development	0.0	14.6	48.3
Operating (loss) income	(7.4)	17.5	314.5
(Loss) income from discontinued operations before income taxes	(7.6)	31.8	317.1
Income tax (benefit) provision	(1.6)	6.1	(54.2)
(Loss) income from discontinued operations, net of tax	(6.0)	25.7	371.3
Gain from sale of discontinued operations before income taxes	0.0	0.0	(183.5)
Provision for income taxes	0.0	0.0	2.4
Gain from sale / impairment of discontinued operations, net of tax	$ 0.0	$ 0.0	$ (181.1)