Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities
Net (loss) income	$ (26.6)	$ 21.0
Adjustments to reconcile net (loss) income to net cash provided by operating activities
Depreciation and amortization	127.6	160.2
Provision for loss on receivables	9.0	11.6
Loss from CyrusOne equity method investment	8.1	0
Asset impairments	0	13.3
Noncash portion of interest expense	5.7	5.8
Deferred income tax provision	1.9	25.8
Pension and other postretirement payments in excess of expense	(43.0)	(24.3)
Stock-based compensation	4.0	3.6
Loss (gain) on sale or disposal of assets, net	2.6	(0.6)
Excess tax benefit for share based payments	(0.5)	0
Other, net	(2.1)	(1.2)
Changes in operating assets and liabilities, net of CyrusOne deconsolidation:
Increase in receivables	(4.4)	(26.1)
Increase in inventory, materials, supplies, prepaid expenses and other current assets	(6.7)	(13.4)
Decrease in accounts payable	(1.0)	(10.4)
Decrease in accrued and other current liabilities	(3.8)	(9.6)
Decrease (increase) in other noncurrent assets	0.1	(4.2)
(Decrease) increase in other noncurrent liabilities	(11.1)	3.5
Net cash provided by operating activities	59.8	155.0
Cash flows from investing activities
Capital expenditures	(142.0)	(242.9)
Dividends received from CyrusOne	14.2	0
Proceeds from sale of assets	1.8	0.6
Increase in restricted cash	0	(11.1)
Release of restricted cash	0.4	0.7
Cash divested from deconsolidation of CyrusOne	(12.2)	0
Net cash used in investing activities	(137.8)	(252.7)
Cash flows from financing activities
Proceeds from issuance of long-term debt	536.0	0
(Decrease) increase in revolving facilities, net	(52.0)	44.0
Repayment of debt	(6.7)	(11.3)
Debt issuance costs	(6.4)	0
Dividends paid on preferred stock	(7.8)	(7.8)
Common stock repurchase	0	(0.3)
Proceeds from exercise of options and warrants	6.8	8.1
Excess tax benefit for share based payments	0.5	0
Other, net	(2.3)	(1.0)
Net cash provided by financing activities	468.1	31.7
Net increase (decrease) in cash and cash equivalents	390.1	(66.0)
Cash and cash equivalents at beginning of period	23.6	73.7
Cash and cash equivalents at end of period	413.7	7.7
Noncash investing and financing transactions:
Investment in CyrusOne resulting from deconsolidation	509.7	0
Accrual of CyrusOne dividends	7.1	0
Acquisition of property by assuming debt and other noncurrent liabilities	5.6	7.8
Acquisition of property on account	$ 20.4	$ 37.9