Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	May 31, 2019	Feb. 28, 2019	May 31, 2018	Feb. 28, 2018	May 31, 2019	May 31, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 5.6	$ (4.6)	$ 8.4	$ 7.3	$ 1.0	$ 15.7
Denominator for basic earnings (loss) per share - weighted average shares outstanding	44.8		44.6		44.7	44.6
Effect of dilutive securities	0.8		0.3		0.9	0.3
Denominator for dilutive earnings (loss) per share - adjusted weighted average shares and assumed conversions	45.6		44.9		45.6	44.9
Net income (loss) per share - Basic	$ 0.13		$ 0.19		$ 0.02	$ 0.35
Net income (loss) per share - Diluted	$ 0.12		$ 0.19		$ 0.02	$ 0.35