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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities      
Net income $ 35.1 $ 102.1 $ 353.7
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 193.0 182.2 170.2
Loss on extinguishment of debt 3.2 19.0 20.9
Gain on sale of CyrusOne investment (117.7) (157.0) (449.2)
Provision for loss on receivables 6.9 9.4 8.5
Noncash portion of interest expense 2.8 3.3 4.6
Deferred income taxes 30.5 59.4 184.5
Pension and other postretirement payments less than (in excess of) expense 6.4 (8.3) (11.5)
Deferred gain on sale of wireless spectrum licenses - discontinued operations 0.0 0.0 (112.6)
Amortization of deferred gain - discontinued operations 0.0 0.0 (6.5)
Stock-based compensation 5.9 5.1 4.1
Gain on transfer of lease obligations - discontinued operations 0.0 0.0 (15.9)
Other, net 2.5 (3.8) 3.2
Changes in operating assets and liabilities:      
Decrease (increase) in receivables 21.3 (18.3) (1.9)
(Increase) decrease in inventory, materials, supplies, prepaid expenses and other current assets (16.6) (6.2) 3.6
Increase (decrease) in accounts payable 22.4 (13.1) (17.0)
Increase (decrease) in accrued and other current liabilities 16.2 (3.0) (30.6)
Decrease (increase) in other noncurrent assets 2.1 (1.3) 1.5
(Decrease) increase in other noncurrent liabilities (10.6) 3.6 1.4
Net cash provided by operating activities 203.4 173.1 111.0
Cash flows from investing activities      
Capital expenditures (210.5) (286.4) (283.6)
Proceeds from sale of Investment in CyrusOne 140.7 189.7 643.9
Acquisitions of businesses, net of cash acquired (167.0) 0.0 0.0
Dividends received from Investment in CyrusOne (equity method investment) 0.0 2.1 22.2
Other, net 0.0 (0.9) 0.7
Net cash (used in) provided by investing activities (236.8) (95.5) 383.2
Cash flows from financing activities      
Proceeds from issuance of long-term debt 943.0 635.0 0.0
Net (decrease) increase in corporate credit and receivables facilities with initial maturities less than 90 days (89.5) 71.9 (1.6)
Repayment of debt (403.0) (759.3) (531.7)
Debt issuance costs (19.1) (11.1) (0.4)
Dividends paid on preferred stock (10.4) (10.4) (10.4)
Common stock repurchase 0.0 (4.8) 0.0
Other, net (0.8) 3.4 (0.6)
Net cash provided by (used in) financing activities 420.2 (75.3) (544.7)
Net increase (decrease) in cash, cash equivalents and restricted cash 386.8 2.3 (50.5)
Cash, cash equivalents and restricted cash at beginning of year 9.7 7.4 57.9
Cash, cash equivalents and restricted cash at end of year $ 396.5 $ 9.7 $ 7.4