Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 380.0	$ 384.2	$ 760.0	$ 763.8
Costs and expenses
Cost of services and products, excluding items below	193.4	195.5	387.1	393.2
Selling, general and administrative, excluding items below	81.3	87.2	169.3	173.3
Depreciation and amortization	74.7	74.2	148.9	153.6
Restructuring and severance related charges	0.4	1.8	15.6	5.1
Transaction and integration costs	2.5	0.6	31.6	3.6
Total operating costs and expenses	352.3	359.3	752.5	728.8
Operating income	27.7	24.9	7.5	35.0
Interest expense	33.5	34.9	67.2	70.0
Other components of pension and postretirement benefit plans expense	3.8	3.0	6.4	5.6
Other (income) expense, net	(0.2)	0.1	(1.0)	(0.9)
Loss before income taxes	(9.4)	(13.1)	(65.1)	(39.7)
Income tax benefit	(1.6)	(7.6)	(23.3)	(7.3)
Net loss	(7.8)	(5.5)	(41.8)	(32.4)
Preferred stock dividends	2.6	2.6	5.2	5.2
Net loss applicable to common shareowners	$ (10.4)	$ (8.1)	$ (47.0)	$ (37.6)
Basic and diluted net loss per common share	$ (0.21)	$ (0.16)	$ (0.93)	$ (0.75)