Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Nov. 30, 2015	Nov. 30, 2014
Income Statement [Abstract]
Net sales	$ 96.3	$ 1,761.3	$ 1,708.3	$ 1,602.2
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	75.4	1,527.4	1,459.5	1,406.2
AR1 research and development (see Note 1(r))	0.0	0.0	32.1	0.0
Selling, general and administrative	2.8	53.6	49.0	38.2
Depreciation and amortization	5.1	64.9	65.1	63.7
Other expense, net:
Loss on debt	0.0	34.5	1.9	60.8
Legal settlement	0.0	0.0	50.0	0.0
Other	0.2	19.7	17.4	13.7
Total operating costs and expenses	83.5	1,700.1	1,675.0	1,582.6
Operating (loss) income	12.8	61.2	33.3	19.6
Non-operating (income) expense:
Interest income	0.0	(0.6)	(0.3)	(0.1)
Interest expense	3.8	32.5	50.4	52.7
Total non-operating expense, net	3.8	31.9	50.1	52.6
(Loss) income from continuing operations before income taxes	9.0	29.3	(16.8)	(33.0)
Income tax provision	2.0	11.2	0.3	16.3
(Loss) income from continuing operations	7.0	18.1	(17.1)	(49.3)
(Loss) income from discontinued operations, net of income taxes	0.0	(0.1)	0.9	(0.7)
Net income (loss)	$ 7.0	$ 18.0	$ (16.2)	$ (50.0)
Basic:
(Loss) income per share from continuing operations (in USD per share)	$ 0.11	$ 0.27	$ (0.28)	$ (0.85)
Income (loss) per share from discontinued operations, net of income taxes (in USD per share)	0.00	0.00	0.01	(0.01)
Net (loss) income per share (in USD per share)	0.11	0.27	(0.27)	(0.86)
Diluted:
(Loss) income per share from continuing operations (in USD per share)	0.10	0.27	(0.28)	(0.85)
Income (loss) per share from discontinued operations, net of income taxes (in USD per share)	0.00	0.00	0.01	(0.01)
Net (loss) income per share (in USD per share)	$ 0.10	$ 0.27	$ (0.27)	$ (0.86)
Weighted average shares of common stock outstanding, basic (in shares)	62.9	65.6	61.1	57.9
Weighted average shares of common stock outstanding, diluted (in shares)	72.5	65.7	61.1	57.9