Discontinued Operations Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Net sales	$ 0.0	$ 540.7	$ 693.9	$ 2,006.3
Cost of goods sold	0.0	321.9	424.0	1,268.9
Gross profit	0.0	218.8	269.9	737.4
Selling, general and administrative	2.5	115.7	233.5	440.6
Research and development	0.0	10.5	14.6	38.1
Operating (loss) income	(2.5)	92.6	21.8	258.7
Income from discontinued operations before income taxes	14.8	91.8	34.6	257.1
Income tax (benefit) provision	(4.1)	13.6	7.6	37.3
Income from discontinued operations, net of tax	18.9	78.2	27.0	219.8
(Loss) gain from sale of discontinued operations before income taxes	0.0	(1.7)	0.0	201.3
Provision for income taxes	0.0	0.0	0.0	2.4
Gain from sale of discontinued operations, net of tax	$ 0.0	$ 1.7	$ 0.0	$ (198.9)	$ 181.1