Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended																12 Months Ended
	Nov. 30, 2018		Aug. 31, 2018		May 31, 2018		Feb. 28, 2018		Nov. 30, 2017		Aug. 31, 2017		May 31, 2017		Feb. 28, 2017		Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 6.9	[1]	$ (1.9)	[1]	$ 8.4	[1]	$ 7.3	[1]	$ (92.9)	[1]	$ 7.9	[1]	$ (6.3)	[1]	$ 3.6	[1]	$ 20.7	$ (87.8)	$ (0.4)
Denominator for basic earnings per share - weighted average shares outstanding																	44.6	44.4	44.0
Effect of dilutive securities																	0.3	0.0	0.0
Denominator for dilutive earnings per share - adjusted weighted average shares and assumed conversions																	44.9	44.4	44.0
Net income (loss) per share - Basic and Diluted	$ 0.15	[2]	$ (0.04)	[2]	$ 0.19	[2]	$ 0.16	[2]	$ (2.10)	[2]	$ 0.18	[2]	$ (0.14)	[2]	$ 0.08	[2]	$ 0.46	$ (1.98)	$ (0.01)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount																	0.2	0.6	1.0

[1] The Company’s income tax benefit (expense) was $6.2 million and $(83.7) million for 2018 and 2017, respectively. The 2017 income tax expense was significantly higher than 2018 primarily as a result of a $79.9 million income tax expense related to valuation allowances on deferred tax assets recorded in 2017. Of that amount, $75.7 million income tax expense was recorded in the U.S. during the fourth quarter of 2017.

[2] 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.