Shareholders' (Deficit) Equity - Summary of Stock-Based Compensation Expense by Type of Award (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	May. 31, 2015	May. 31, 2014	Aug. 31, 2015	Aug. 31, 2014	Nov. 30, 2015	Nov. 30, 2014	Nov. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 5.3	$ 1.4	$ 8.3	$ 3.0	$ 10.4	$ 4.5	$ 8.6	$ 5.7	$ 14.1
SARS [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense							1.8	(3.2)	9.4
Restricted Stock, Service-Based [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense							5.6	4.3	2.3
Restricted Stock, Performance-Based [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense							0.1	4.3	2.1
Employee Stock Purchase Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense							0.3	0.0	0.0
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense							$ 0.8	$ 0.3	$ 0.3