CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ (863.8)	$ (55.6)
Pension and other postretirement plans adjustments:
Amortization of net actuarial losses	[1]	0.1	0.2
Amortization of prior service costs	[2]	0.1	0.5
Other comprehensive income		0.2	0.7
Comprehensive income (loss)		$ (863.6)	$ (54.9)

[1] Presented net of income tax expense of $0.1 million during the three months ended March 31, 2016 and 2015, respectively.

[2] Presented net of income tax expense of $0.3 million during the three months ended March 31, 2015.