Consolidated Statements of Operations - USD ($)	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2021	Sep. 07, 2021	Dec. 31, 2022	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 554,400,000	$ 1,138,700,000	$ 1,796,000,000.0	$ 1,559,800,000
Costs and expenses
Cost of services and products, excluding items below	302,100,000	619,500,000	987,800,000	802,000,000.0
Selling, general and administrative, excluding items below	115,400,000	243,400,000	392,400,000	346,500,000
Depreciation and amortization	144,600,000	194,900,000	497,100,000	293,400,000
Loss on impairment of long-lived assets	0	0	2,700,000	0
Restructuring and severance related charges	600,000	1,200,000	2,000,000.0	16,900,000
Transaction and integration costs	800,000	54,800,000	11,300,000	35,000,000.0
Gain on sale of assets, net	0	(2,800,000)	0	0
Total operating costs and expenses	563,500,000	1,111,000,000.0	1,893,300,000	1,493,800,000
Operating (loss) income	(9,100,000)	27,700,000	(97,300,000)	66,000,000.0
Interest expense	28,300,000	89,100,000	90,100,000	134,200,000
Other components of pension and postretirement benefit plans (benefit) expense	(4,700,000)	6,400,000	(7,800,000)	14,100,000
Loss on extinguishment of debt, net	2,100,000	10,700,000	0	0
Other (income) expense, net	(300,000)	19,700,000	(13,600,000)	(1,200,000)
Loss before income taxes	(34,500,000)	(98,200,000)	(166,000,000.0)	(81,100,000)
Income tax benefit	(7,300,000)	(16,900,000)	(35,100,000)	(25,500,000)
Net loss	(27,200,000)	(81,300,000)	(130,900,000)	(55,600,000)
Preferred stock dividends	0	7,600,000	0	10,400,000
Net loss applicable to common shareowners	$ (27,200,000)	$ (88,900,000)	$ (130,900,000)	$ (66,000,000.0)