Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue
Revenues	$ 1,378.2	$ 1,065.7	$ 1,017.6
Costs and expenses
Cost of Goods and Services Sold	698.7	531.0	507.3
Selling, general and administrative	313.4	235.1	216.3
Depreciation and amortization	252.0	193.0	182.2
Restructuring and severance related charges	8.3	32.7	11.9
Transaction and integration cost	22.5	18.5	0.0
Other	0.0	0.0	1.1
Total operating costs and expenses	1,294.9	1,010.3	918.8
Operating income	83.3	55.4	98.8
Interest expense	131.5	85.2	75.7
Loss on extinguishment of debt, net	1.3	3.2	19.0
Other components of pension and postretirement benefit plans expense	12.5	16.6	4.3
Gain on sale of CyrusOne investment	0.0	(117.7)	(157.0)
Other (income) expense, net	(1.6)	1.4	(7.6)
(Loss) income from continuing operations before income taxes	(60.4)	66.7	164.4
Income tax expense	9.4	26.7	61.7
(Loss) Income from continuing operations	(69.8)	40.0	102.7
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.3
Net income (loss)	(69.8)	40.0	103.0
Preferred stock dividends	10.4	10.4	10.4
Net (loss) income applicable to common shareowners	$ (80.2)	$ 29.6	$ 92.6
Basic net (loss) earnings per common share	$ (1.73)	$ 0.70	$ 2.20
Diluted net (loss) earnings per common share	$ (1.73)	$ 0.70	$ 2.20
Weighted-average common shares outstanding - basic	46.3	42.2	42.0
Weighted-average common shares outstanding - diluted	46.3	42.4	42.1
Continuing Operations [Member]
Costs and expenses
Depreciation and amortization	$ 252.0	$ 193.0	$ 182.2
Income tax expense	9.4	26.7	61.7
(Loss) Income from continuing operations	(69.8)	40.0	102.7
Preferred stock dividends	$ 10.4	$ 10.4	$ 10.4
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$ (1.73)	$ 0.70	$ 2.19
Diluted (loss) earnings per common share from continuing operations	$ (1.73)	$ 0.70	$ 2.19
Weighted-average common shares outstanding - basic	46.3	42.2	42.0
Weighted-average common shares outstanding - diluted	46.3	42.4	42.1
Discontinued Operations [Member]
Costs and expenses
Other (income) expense, net			$ (0.3)
Income (loss) from discontinued operations, net of tax	$ 0.0	$ 0.0	0.3
Preferred stock dividends	$ 0.0	$ 0.0	$ 0.0
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share	$ 0.00	$ 0.00	$ 0.01
Diluted (loss) earnings per common share from discontinued operations	$ 0.00	$ 0.00	$ 0.01
Weighted-average common shares outstanding - basic	0.0	0.0	42.0
Weighted-average common shares outstanding - diluted	0.0	0.0	42.1