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Statements of Consolidated Cash Flows (Unaudited) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating Activities:    
Net loss $ (0.2) $ (6.3)
Noncash items included in net loss:    
Depreciation and amortization 75.3 74.3
Noncash equity-based compensation and employee benefits expense 12.1 11.7
Losses on property disposals, net 5.4 1.7
Other noncash items, net 3.6 6.8
Changes in assets and liabilities, net:    
Accounts receivable (65.6) (61.5)
Accounts payable 17.8 (0.3)
Other operating assets (17.4) (0.6)
Other operating liabilities 40.5 14.9
Net cash provided by operating activities 71.5 40.7
Investing Activities:    
Acquisition of property and equipment (46.5) (39.0)
Proceeds from disposal of property and equipment 4.2 6.7
Net cash used in investing activities (42.3) (32.3)
Financing Activities:    
Repayments of long-term debt (14.6) (9.4)
Debt issuance costs 0.0 (3.2)
Payments for tax withheld on equity-based compensation (1.6) (2.3)
Net cash used in financing activities (16.2) (14.9)
Net Increase (Decrease) In Cash, Cash Equivalents and Restricted Amounts Held in Escrow 13.0 (6.5)
Cash, Cash Equivalents and Restricted Amounts Held in Escrow, Beginning of Period 145.7 275.7
Cash, Cash Equivalents and Restricted Amounts Held in Escrow, End of Period 158.7 269.2
Supplemental Cash Flow Information:    
Interest paid (49.4) (54.1)
Income tax refund (payment), net $ (2.9) $ 3.0