Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net income	$ 103.4	$ 321.1
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	134.7	131.0
Loss on extinguishment of debt	14.2	21.3
Provision for loss on receivables	7.2	6.5
Gain on sale of CyrusOne investment	(151.9)	(412.9)
Noncash portion of interest expense	2.4	3.5
Deferred income tax provision	59.3	173.1
Pension and other postretirement payments in excess of expense	(3.9)	(9.9)
Stock-based compensation	4.8	3.1
Deferred gain on sale of wireless spectrum licenses - discontinued operations	0.0	(112.6)
Amortization of deferred gain - discontinued operations	0.0	(6.5)
Gain on transfer of lease obligations - discontinued operations	0.0	(15.9)
Other, net	(3.0)	3.3
Changes in operating assets and liabilities:
Increase in receivables	(11.0)	(5.9)
Increase in inventory, materials, supplies, prepaid expenses and other current assets	(6.0)	(0.3)
(Decrease) increase in accounts payable	(3.9)	8.8
Decrease in accrued and other current liabilities	(3.9)	(19.8)
(Increase) decrease in other noncurrent assets	(2.1)	1.8
Increase in other noncurrent liabilities	1.4	5.0
Net cash provided by operating activities	141.7	94.7
Cash flows from investing activities
Capital expenditures	(188.8)	(205.7)
Increase in restricted cash	(90.7)	0.0
Dividends received from CyrusOne	6.2	19.5
Proceeds from sale of assets	0.0	0.6
Proceeds from sale of CyrusOne investment	181.2	596.3
Other, net	(0.8)	(0.2)
Net cash (used in) provided by investing activities	(92.9)	410.5
Cash flows from financing activities
Proceeds from issuance of long-term debt	425.0	0.0
Net increase (decrease) in corporate credit and receivables facilities with initial maturities less than 90 days	5.9	(19.2)
Repayment of debt	(461.0)	(509.8)
Debt issuance costs	(8.4)	(0.4)
Dividends paid on preferred stock	(7.8)	(7.8)
Common stock repurchase	(4.8)	0.0
Other, net	3.4	(0.5)
Net cash used in financing activities	(47.7)	(537.7)
Net increase (decrease) in cash and cash equivalents	1.1	(32.5)
Cash and cash equivalents at beginning of period	7.4	57.9
Cash and cash equivalents at end of period	8.5	25.4
Noncash investing and financing transactions:
Accrual of CyrusOne dividends	1.2	2.7
Acquisition of property by assuming debt and other noncurrent liabilities	10.9	4.3
Acquisition of property on account	$ 43.0	$ 29.3