Condensed Consolidated Statements of Operations - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 389.5	$ 382.5	$ 1,149.5	$ 1,146.3
Costs and expenses
Cost of services and products, excluding items below	203.9	194.7	591.0	587.9
Selling, general and administrative, excluding items below	86.0	88.0	255.3	261.3
Depreciation and amortization	71.9	75.5	220.8	229.1
Restructuring and severance related charges	0.8	1.3	16.4	6.4
Transaction and integration costs	2.2	0.2	33.8	3.8
Total operating costs and expenses	364.8	359.7	1,117.3	1,088.5
Operating income	24.7	22.8	32.2	57.8
Interest expense	33.4	35.0	100.6	105.0
Other components of pension and postretirement benefit plans expense	2.6	2.8	9.0	8.4
Other (income) expense, net	(0.2)	0.5	(1.2)	(0.4)
Loss before income taxes	(11.1)	(15.5)	(76.2)	(55.2)
Income tax benefit	(2.9)	(1.9)	(26.2)	(9.2)
Net loss	(8.2)	(13.6)	(50.0)	(46.0)
Preferred stock dividends	2.6	2.6	7.8	7.8
Net loss applicable to common shareowners	$ (10.8)	$ (16.2)	$ (57.8)	$ (53.8)
Basic and diluted net loss per common share	$ (0.21)	$ (0.32)	$ (1.14)	$ (1.07)