CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ (116.7)	$ (53.6)
Fair value of plan assets adjustment(1)		0.0	0.3	[1]
Pension and other postretirement plans adjustments:
Amortization of prior service costs		0.1	0.1
Amortization of actuarial losses(2)		0.1	0.2	[2]
Curtailment Gain (Loss), after Tax(3)	[3]	(0.4)
Other comprehensive income		(0.2)	0.6
Comprehensive income (loss)		(116.9)	(53.0)
Amortization of net actuarial loss, income tax expense		$ 0.0	$ 0.1

[1] (1) Adjustment recorded during the three months ended March 31, 2018, related to a change in the fair value of plan assets as of December 31, 2017.

[2] (2) Presented net of income tax benefit of $0.1 million during the three months ended March 31, 2018.

[3] (3) Presented net of income tax expense of $0.1 million during the three months ended March 31, 2019.