Restatement - Schedule of Effects of Prior Period Errors on the Consolidated Financial Statements - Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2016	Feb. 28, 2015	Aug. 31, 2015	Nov. 30, 2014	Nov. 30, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)	$ 7.0	$ 5.1	$ (3.3)
Other comprehensive income:
Amortization of prior service credits, net of income taxes			12.1
Comprehensive income	$ 1.7	$ 14.2	8.8
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)			(3.9)
Other comprehensive income:
Amortization of prior service credits, net of income taxes			12.2
Comprehensive income			8.3
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income (loss)			0.6	$ (0.3)	$ 3.0	$ (5.0)
Other comprehensive income:
Amortization of prior service credits, net of income taxes			(0.1)
Comprehensive income			$ 0.5