Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities:
Net income (loss)	$ 2.7	$ (3.3)
Noncash items included in net income (loss):
Depreciation and amortization	110.2	111.0
Equity-based compensation and employee benefits expense	16.2	16.9
Deferred income tax benefit, net	0.0	(4.8)
Non-union pension settlement charge	7.2	0.0
Losses on property disposals, net	7.3	3.0
Other noncash items, net	4.9	12.5
Changes in assets and liabilities, net:
Accounts receivable	(58.9)	(78.8)
Accounts payable	32.9	12.9
Other operating assets	3.1	11.4
Other operating liabilities	32.3	(14.2)
Net cash provided by operating activities	157.9	66.6
Investing Activities:
Acquisition of property and equipment	(92.4)	(70.8)
Proceeds from disposal of property and equipment	4.9	8.2
Net cash used in investing activities	(87.5)	(62.6)
Financing Activities:
Repayments of long-term debt	(20.9)	(48.2)
Debt issuance costs	0.0	(14.3)
Payments for tax withheld on equity-based compensation	(2.0)	(2.4)
Net cash used in financing activities	(22.9)	(64.9)
Net Increase (Decrease) In Cash, Cash Equivalents and Restricted Amounts Held in Escrow	47.5	(60.9)
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	193.2	214.8
Supplemental Cash Flow Information:
Interest paid	(71.3)	(78.7)
Income tax refund (payment), net	$ (3.7)	$ 3.2