Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Dec. 31, 2015	Mar. 31, 2016	Feb. 28, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 7.0	$ 5.1	$ (3.3)
Other comprehensive income:
Actuarial losses, net of income taxes	(8.6)	0.0	0.0
Amortization of actuarial losses and prior service credits, net of income taxes	3.3	9.1	12.1
Comprehensive income	$ 1.7	$ 14.2	$ 8.8