Quarterly Financial Data Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended															6 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2016	Aug. 31, 2016		May 31, 2016		Feb. 29, 2016		Nov. 30, 2015		Aug. 31, 2015		May 31, 2015		Feb. 28, 2015		May 31, 2015		Aug. 31, 2015		Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Quarterly Financial Information [Line Items]
Net sales	$ 187.0	$ 195.6		$ 202.0		$ 175.3		$ 200.0		$ 210.9		$ 220.2		$ 206.9						$ 759.9	$ 838.0	$ 987.4
Gross profit	(49.1)	(52.1)	[1],[2]	(58.4)	[1],[2]	(44.3)	[1],[2]	(47.8)	[1],[2]	(51.5)	[1],[2]	(52.9)	[1],[2]	(41.7)	[1],[2]					(556.0)	(644.1)	(788.0)
Restructuring and severance	6.2	0.4		1.1		1.6		1.4		3.4		1.1		0.0						11.1	5.9	0.9
Loss on disposal of fixed assets	(0.2)	0.0		0.1		0.0		0.2		0.0		0.0		0.0						0.3	0.2	0.5
Asset impairments and write-offs	(5.4)	0.0		0.0		(0.3)		(18.3)		(0.5)		(0.6)		0.0						(5.7)	(19.4)	0.0
Debt issuance costs write-off	1.2	1.7		0.0		0.0		0.6		0.0		0.0		0.0						2.9	0.6	0.8
(Loss) income from continuing operations								(18.9)		0.4		3.0		(3.2)						(0.4)	(18.7)	12.1
Gain from discontinued operations								0.0		0.0		0.9		0.0							0.9	(0.6)
Net (loss) income	$ (11.3)	$ 4.7		$ 7.2		$ (1.1)		$ (18.9)		$ 0.4		$ 3.9		$ (3.2)						$ (0.4)	$ (17.8)	$ 11.5
Income (loss) per share from continuing operations
Income (loss) per share from continuing operations - Basic (in dollars per share)								$ (0.43)	[3]	$ 0.01	[3]	$ 0.07	[3]	$ (0.07)	[3]					$ (0.01)	$ (0.41)	$ 0.26
Income (Loss) from Continuing Operations, Per Diluted Share																				(0.01)	(0.41)	0.26
Net income (loss) per share
Net income (loss) per share - Basic (in dollars per share)	$ (0.25)	$ 0.11	[3]	$ 0.16	[3]	$ (0.03)	[3]	$ (0.43)	[3]					$ (0.07)	[3]	$ 0.09	[3]	$ 0.01	[3]	(0.01)	(0.39)	0.25
Earnings Per Share, Diluted	$ (0.26)	$ 0.10	[3]	$ 0.16	[3]	$ (0.03)	[3]													$ (0.01)	$ (0.39)	$ 0.25
Depreciation expense																				$ 26.8	$ 30.3	$ 29.5
LIFO inventory reserve adjustment	$ 1.4	$ 0.6		$ 0.3		$ 0.5		$ 3.7		$ 2.1		$ 1.5		$ 2.2						(1.8)	(9.5)
Income tax (Expense) Benefit																				$ 10.3	$ (2.4)	$ (0.4)
Effective Income Tax Rate																				(104.00%)	11.40%	(3.40%)
Other Tax Expense (Benefit)																				$ 1.6
Maximum [Member]
Net income (loss) per share
Common stock price range per share (in dollars per share)	$ 10.35	$ 10.21		$ 7.37		$ 7.43		$ 7.55		$ 8.24		$ 8.62		$ 8.52		8.62		8.24		$ 10.35	$ 7.55
Minimum [Member]
Net income (loss) per share
Common stock price range per share (in dollars per share)	$ 7.15	$ 5.95		$ 5.22		$ 4.69		$ 5		$ 5.76		$ 7.3		$ 6.54		$ 7.3		$ 5.76		$ 7.15	$ 5
Manufacturing Facilities and Equipment [Member]
Net income (loss) per share
Depreciation expense	$ 5.0	$ 4.7		$ 4.9		$ 7.7		$ 8.2		$ 7.8		$ 5.0		$ 5.0						$ 22.3	$ 26.0	$ 23.4
Senior Notes [Member]
Net income (loss) per share
Premium paid for debt redemption																					$ 1.0

[1] Gross profit excludes depreciation and amortization expense. Depreciation and amortization expense related to manufacturing facilities and equipment was $7.7 million, $4.9 million, $4.7 million, and $5.0 million for the three months ended February 29, 2016, May 31, 2016, August 31, 2016, and November 30, 2016, and $5.0 million, $5.0 million, $7.8 million, and $8.2 million for the three months ended February 28, 2015, May 31, 2015, August 31, 2015 and November 30, 2015, respectively.

[2] Gross profit includes net LIFO inventory reserve adjustments of $0.5 million of income, $0.3 million of expense, $0.6 million of expense, and $1.4 million of expense for the three months ended February 29, 2016, May 31, 2016, August 31, 2016, and November 30, 2016, respectively, and $2.2 million of income, $1.5 million of income, $2.1 million of income, and $3.7 million of income for the three months ended February 28, 2015, May 31, 2015, August 31, 2015, and November 30, 2015, respectively.

[3] The sum of the quarterly earnings per share amounts may not equal the annual amount due to changes in the number of shares outstanding during the year.