Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue
Services	$ 933.0	$ 890.2	$ 871.9
Products	234.8	271.3	201.5
Total revenue	1,167.8	1,161.5	1,073.4
Costs and expenses
Cost of services, excluding items below	472.5	416.2	386.2
Cost of products sold, excluding items below	198.1	231.5	175.1
Selling, general and administrative	219.1	204.2	187.9
Depreciation and amortization	141.6	127.6	128.4
Restructuring charges (reversals)	6.0	(0.4)	13.5
Transaction-related compensation	0.0	0.0	42.6
Curtailment loss (gain)	0.3	0.0	(0.6)
Loss (gain) on sale or disposal of assets, net	0.8	(0.3)	(1.1)
Impairment of assets	0.0	4.6	0.0
Transaction costs	1.4	1.2	1.6
Total operating costs and expenses	1,039.8	984.6	933.6
Operating income	128.0	176.9	139.8
Interest expense	103.1	145.9	176.0
Loss on extinguishment of debt	20.9	19.6	29.6
Loss from CyrusOne investment	5.1	7.0	10.7
Gain on sale of CyrusOne investment	(449.2)	(192.8)	0.0
Other income, net	(2.5)	(1.9)	(3.3)
Income (loss) from continuing operations before income taxes	450.6	199.1	(73.2)
Income tax expense (benefit)	159.8	81.4	(8.3)
Income (loss) from continuing operations	290.8	117.7	(64.9)
Income (loss) from discontinued operations, net of tax	62.9	(42.1)	10.2
Net income (loss)	353.7	75.6	(54.7)
Preferred stock dividends	10.4	10.4	10.4
Net income (loss) applicable to common shareowners	$ 343.3	$ 65.2	$ (65.1)
Basic earnings (loss) per common share from continuing operations	$ 1.34	$ 0.51	$ (0.37)
Basic earnings (loss) per common share from discontinued operations	0.30	(0.20)	0.05
Basic net earnings (loss) per common share	1.64	0.31	(0.32)
Diluted earnings (loss) per common share from continuing operations	1.33	0.51	(0.37)
Diluted earnings (loss) per common share from discontinued operations	0.30	(0.20)	0.05
Diluted net earnings (loss) per common share	$ 1.63	$ 0.31	$ (0.32)
Weighted-average common shares outstanding - basic	209.6	208.5	205.9
Weighted-average common shares outstanding - diluted	210.2	209.6	205.9
Corporate Segment [Member]
Costs and expenses
Depreciation and amortization	$ 0.1	$ 0.2	$ 0.5
Restructuring charges (reversals)	1.6	0.1	3.7
Operating income	(22.5)	(21.8)	(58.1)
Continuing Operations [Member]
Costs and expenses
Depreciation and amortization	141.6	127.6	128.4
Income tax expense (benefit)	159.8	81.4	(8.3)
Income (loss) from continuing operations	290.8	117.7	(64.9)
Preferred stock dividends	$ 10.4	$ 10.4	$ 10.4