Statement of Consolidated Shareholders' Deficit (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) $ in Millions	Total	Preferred Stock:	Common Stock:	Capital Surplus:	Accumulated Deficit:	Accumulated Other Comprehensive Loss:	Amortization of prior net losses	Amortization of prior service credit	Settlement adjustment	Net actuarial gain	Foreign currency translation adjustments	Treasury Stock, At Cost:
Beginning balance at Dec. 31, 2017				$ 2,323.3	$ (2,228.6)	$ (355.8)						$ (92.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation				3.5
Net income					2.7
Change in other comprehensive income							$ 11.1	$ (0.3)	$ 7.2	$ 0.7	$ (0.2)
Ending balance at Sep. 30, 2018	$ (328.8)	$ 0.0	$ 0.3	$ 2,326.8	$ (2,225.9)	$ (337.3)						$ (92.7)