Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2015	Aug. 31, 2015	May. 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May. 31, 2014	Feb. 28, 2014	May. 31, 2015	May. 31, 2014	Aug. 31, 2015	Aug. 31, 2014	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 486.5	$ 441.0	$ 457.8	$ 323.0	$ 443.6	$ 420.4	$ 406.6	$ 331.6	$ 780.8	$ 738.2	$ 1,221.8	$ 1,158.6	$ 1,708.3	$ 1,602.2	$ 1,378.1
Cost of sales (exclusive of items shown separately on Statement of Operations)	428.3	373.1	372.7	285.4	373.9	375.8	369.0	287.5	658.1	656.5	1,031.2	1,032.3	1,459.5	1,406.2	1,234.3
Income (loss) before income taxes	15.5	(60.2)	37.2	(9.3)	26.6	(11.2)	(48.2)	(0.2)	27.9	(48.4)	(32.3)	(59.6)	(16.8)	(33.0)	(35.7)
(Loss) income from continuing operations	7.6	(38.5)	17.3	(3.5)	12.0	(10.7)	(48.4)	(2.2)	13.8	(50.6)	(24.7)	(61.3)	(17.1)	(49.3)	162.7
(Loss) income from discontinued operations, net of income taxes	0.1	0.6	0.0	0.2	(0.1)	0.2	(0.8)	0.0	0.2	(0.8)	0.8	(0.6)	0.9	(0.7)	0.2
Net (loss) income	$ 7.7	$ (37.9)	$ 17.3	$ (3.3)	$ 11.9	$ (10.5)	$ (49.2)	$ (2.2)	$ 14.0	$ (51.4)	$ (23.9)	$ (61.9)	$ (16.2)	$ (50.0)	$ 162.9
Basic (loss) income per share from continuing operations (in USD per share)	$ 0.12	$ (0.62)	$ 0.28	$ (0.06)	$ 0.20	$ (0.19)	$ (0.84)	$ (0.04)	$ 0.23				$ (0.28)	$ (0.85)	$ 2.68
Basic (loss) income per share from discontinued operations, net of income taxes (in USD per share)	0.00	0.01	0.00	0.00	0.00	0.00	(0.01)	0.00	0.00				0.01	(0.01)	0.00
Basic net (loss) income per share (in USD per share)	0.12	(0.61)	0.28	(0.06)	0.20	(0.19)	(0.85)	(0.04)	0.23				(0.27)	(0.86)	2.68
Diluted (loss) income per share from continuing operations (in USD per share)	0.12	(0.62)	0.25	(0.06)	0.18	(0.19)	(0.84)	(0.04)	0.22				(0.28)	(0.85)	2.05
Diluted (loss) income per share from discontinued operations, net of income taxes (in USD per share)	0.00	0.01	0.00	0.00	0.00	0.00	(0.01)	0.00	0.00				0.01	(0.01)	0.00
Diluted net (loss) income per share (in USD per share)	$ 0.12	$ (0.61)	$ 0.25	$ (0.06)	$ 0.18	$ (0.19)	$ (0.85)	$ (0.04)	$ 0.22				$ (0.27)	$ (0.86)	$ 2.05