Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Revenue	$ 274.7	$ 273.3	$ 819.1	$ 824.5
Costs and expenses
Cost of services and products, excluding items below	132.6	133.1	398.2	400.4
Selling, general and administrative, excluding items below	65.3	67.2	191.4	194.9
Depreciation and amortization	80.1	88.3	237.8	291.6
Restructuring and severance related charges	0.9	0.0	0.8	0.0
Transaction costs	0.0	0.0	0.1	0.1
Impairment of assets	3.1	0.0	3.1	0.0
Total operating costs and expenses	282.0	288.6	831.4	887.0
Operating loss	(7.3)	(15.3)	(12.3)	(62.5)
Interest expense	46.6	43.1	133.5	119.3
Other components of pension and postretirement benefit plans (benefit) expense	(3.2)	0.1	(4.7)	0.5
Other expense (income), net	20.4	(14.1)	(16.1)	(38.5)
Loss from continuing operations before income taxes	(71.1)	(44.4)	(125.0)	(143.8)
Income tax (benefit) expense	(1.0)	(4.4)	30.2	(10.9)
Loss from continuing operations	(70.1)	(40.0)	(155.2)	(132.9)
Income (loss) from discontinued operations (net of tax)	8.7	(2.7)	18.6	10.2
Net loss	$ (61.4)	$ (42.7)	$ (136.6)	$ (122.7)