Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended																12 Months Ended
	Nov. 30, 2019	Aug. 31, 2019		May 31, 2019		Feb. 28, 2019		Nov. 30, 2018		Aug. 31, 2018		May 31, 2018		Feb. 28, 2018		Feb. 28, 2017	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017
Condensed Income Statements, Captions [Line Items]
Net Sales	$ 169.2	$ 192.4		$ 205.7		$ 168.9		$ 191.3		$ 193.6		$ 206.3		$ 178.7			$ 736.2	$ 769.8	$ 783.1
Gross profit(1)(2)	44.2	46.3	[1],[2]	48.8	[1],[2]	36.9	[1],[2]	43.5	[1],[2]	49.1	[1],[2]	51.6	[1],[2]	46.6	[1],[2]		176.2	190.7	200.8
Restructuring and severance	0.6	0.8		2.8		1.1		1.7		0.3		0.2		1.3			5.3	3.5	5.7
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax																	21.2	4.3	(2.3)
(Gain) Loss on asset sales	3.9	(0.1)		0.0		0.0		(0.9)		0.0		0.0		0.0			(4.0)	(0.9)	0.4
Asset impairments and write-offs	6.8	1.0		0.0		0.0		3.9		9.2		0.4		0.0			7.8	13.5	32.9
Debt issuance costs write-off	0.0	0.2		0.0		0.0								0.8			0.2	0.8	0.0
Net income (loss)	$ (23.7)	$ 0.3	[3]	$ 5.6	[3]	$ (4.6)	[3]	$ 6.9		$ (1.9)		$ 8.4		$ 7.3			$ (22.4)	$ 20.7	$ (87.8)
Net income (loss) per share(4)
Net (loss) income per share(3)	$ (0.54)	$ 0.01		$ 0.13		$ (0.10)		$ 0.15	[3]	$ (0.04)	[3]	$ 0.19	[3]	$ 0.16	[3]		$ (0.50)	$ 0.46	$ (1.98)
Earnings Per Share, Diluted	(0.53)			0.12
Maximum [Member]
Net income (loss) per share(4)
Common stock price range per share	10.13	10.08		8.52		9.25		10.70		10.80		11.90		11.60			10.13	10.70
Minimum [Member]
Net income (loss) per share(4)
Common stock price range per share	$ 10.05	$ 5.48		$ 5.77		$ 6.28		$ 7.36		$ 8.30		$ 9.95		$ 9.55			$ 10.05	$ 7.36
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Condensed Income Statements, Captions [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax														$ 0.0		$ 0.0	$ 17.9	$ 0.0	$ (6.3)

[1] Gross profit excludes depreciation and amortization expense. Depreciation and amortization expense related to manufacturing facilities and equipment was $5.6 million, $5.4 million, $5.0 million, and $5.4 million for the three months ended February 28, 2019, May 31, 2019, August 31, 2019, and November 30, 2019 and $4.9 million, $5.0 million, $5.5 million, and $5.4 million for the three months ended February 28, 2018, May 31, 2018, August 31, 2018, and November 30, 2018, respectively.

[2] Gross profit includes net LIFO inventory reserve adjustments of $0.8 million of expense, $0.6 million of expense, $1.2 million of expense, and $0.4 million of expense for the three months ended February 28, 2019, May 31, 2019, August 31, 2019 and November 30, 2019, respectively, and $0.8 million of expense, $1.5 million of expense, $0.9 million of income and $0.6 million of expense for the three months ended February 28, 2018, May 31, 2018, August 31, 2018, and November 30, 2018, 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.