Statements of Consolidated Shareholders' Deficit (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Capital Surplus	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock, At Cost
Beginning balance at Dec. 31, 2020	$ (223.3)	$ 0.5	$ 2,383.6	$ (2,365.9)	$ (148.8)	$ (92.7)
Equity-based compensation	1.8		1.8
Net loss	(63.3)			(63.3)
Amortization of prior net losses	3.0				3.0
Amortization of prior service credit	(0.1)				(0.1)
Foreign currency translation	0.7				0.7
Ending balance at Mar. 31, 2021	(281.2)	0.5	2,385.4	(2,429.2)	(145.2)	(92.7)
Beginning balance at Dec. 31, 2021	(363.5)	0.5	2,388.3	(2,475.0)	(184.6)	(92.7)
Equity-based compensation	1.8		1.8
Net loss	(27.5)			(27.5)
Amortization of prior net losses	2.2				2.2
Amortization of prior service credit	(0.1)				(0.1)
Foreign currency translation	0.2				0.2
Ending balance at Mar. 31, 2022	$ (386.9)	$ 0.5	$ 2,390.1	$ (2,502.5)	$ (182.3)	$ (92.7)