Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenue	$ 1,096.3	$ 1,100.1	$ 1,091.5
Costs and expenses
Cost of services and products, excluding items below	530.8	533.7	518.2
Selling, general and administrative, excluding items below	263.7	266.8	244.3
Depreciation and amortization	338.9	369.5	408.8
Restructuring and severance related charges	60.5	10.8	0.0
Transaction and integration costs	4.0	0.4	3.6
Impairment of assets	3.1	0.0	2.7
Total operating costs and expenses	1,201.0	1,181.2	1,177.6
Operating loss	(104.7)	(81.1)	(86.1)
Interest expense	175.5	160.2	89.5
Other components of pension and postretirement benefit plans (benefit) expense	(5.5)	0.7	(7.8)
Other income, net	(37.2)	(17.9)	(11.5)
Loss from continuing operations before income taxes	(237.5)	(224.1)	(156.3)
Income tax benefit	(13.9)	(16.4)	(8.0)
Loss from continuing operations	(223.6)	(207.7)	(148.3)
Income from discontinued operations (net of tax)	94.3	15.0	17.4
Net loss	$ (129.3)	$ (192.7)	$ (130.9)