CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 68.5	$ 98.3
Cost of sales	53.9	65.6
Gross margin	14.6	32.7
Selling, general and administrative expenses	10.8	9.2
Research and development expenses	1.0	0.8
Restructuring and other charges	4.8	0.1
Separation-related costs	0.1	1.6
Total costs and expenses	70.6	77.3
(Loss)/income from operations before equity in net loss of unconsolidated affiliate and income taxes	(2.1)	21.0
Equity in net loss of unconsolidated affiliate	(0.1)	0.0
(Loss)/income from operations before income taxes	(2.2)	21.0
Income tax (benefit)/expense	(0.3)	4.1
Net (loss)/income	$ (1.9)	$ 16.9
Net (loss)/income per weighted average share - basic (in dollars per share)	$ (0.01)	$ 0.12
Net (loss)/income per weighted average share - diluted (in dollars per share)	$ (0.01)	$ 0.12
Weighted average common shares outstanding - basic (in shares)	146.1	146.0
Weighted average common shares outstanding - diluted (in shares)	146.1	146.5