Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2015	May. 31, 2014
Income Statement [Abstract]
Net sales	$ 456.9	$ 404.5	$ 775.5	$ 736.6
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	372.5	369.4	655.3	657.9
Selling, general and administrative	12.6	9.2	28.1	18.4
Depreciation and amortization	16.1	15.7	32.1	30.6
Other expense, net:
Loss on debt repurchased	0.5	45.9	0.7	50.8
Other	2.3	2.4	3.8	5.1
Total operating costs and expenses	404.0	442.6	720.0	762.8
Operating income (loss)	52.9	(38.1)	55.5	(26.2)
Non-operating (income) expense:
Interest income	0.0	0.0	(0.1)	0.0
Interest expense	13.2	12.6	26.6	25.0
Total non-operating expense, net	13.2	12.6	26.5	25.0
Income (loss) from continuing operations before income taxes	39.7	(50.7)	29.0	(51.2)
Income tax provision (benefit)	21.3	(0.6)	14.7	1.2
Income (loss) from continuing operations	18.4	(50.1)	14.3	(52.4)
(Loss) income from discontinued operations, net of income taxes	0.0	(0.8)	0.2	(0.8)
Net income (loss)	$ 18.4	$ (50.9)	$ 14.5	$ (53.2)
Basic
Income (loss) per share from continuing operations (in USD per share)	$ 0.29	$ (0.87)	$ 0.23	$ (0.90)
Loss per share from discontinued operations, net of income taxes (in USD per share)	0.00	(0.01)	0.00	(0.01)
Net income (loss) per share (in USD per share)	0.29	(0.88)	0.23	(0.91)
Diluted
Income (loss) per share from continuing operations (in USD per share)	0.26	(0.87)	0.22	(0.90)
Loss per share from discontinued operations, net of income taxes (in USD per share)	0.00	(0.01)	0.00	(0.01)
Net income (loss) per share (in USD per share)	$ 0.26	$ (0.88)	$ 0.22	$ (0.91)
Weighted average shares of common stock outstanding, basic (in shares)	61.2	57.9	59.9	58.7
Weighted average shares of common stock outstanding, diluted (in shares)	72.3	57.9	72.2	58.7