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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
OPERATING ACTIVITIES    
Net loss $ (907.6) $ (3,007.7)
Adjustments to reconcile net loss to net cash used in operating activities:    
Loss on impairment 756.5 2,808.2
Depreciation expense 122.1 164.5
Deferred income tax expense (benefit) 0.9 (79.5)
Debt discounts and other 0.0 14.2
Share-based compensation expense 3.8 7.8
Amortization, net (4.6) 2.8
Equity in losses (earnings) of ARO (1.9) 6.3
Adjustment to gain on bargain purchase 0.0 6.3
Gain on extinguishment of debt 0.0 (3.1)
Other 0.4 9.7
Changes in operating assets and liabilities 20.9 (129.9)
Contributions to pension plans and other post-retirement benefits 22.2 4.0
Net cash used in operating activities (31.7) (204.4)
INVESTING ACTIVITIES    
Additions to property and equipment 6.0 36.3
Net proceeds from disposition of assets 3.7 10.4
Net cash used in investing activities (2.3) (25.9)
FINANCING ACTIVITIES    
Borrowings on credit facility 0.0 343.9
Repayments of credit facility borrowings 0.0 15.0
Reduction of long-term borrowings 0.0 9.7
Other 0.0 (0.9)
Net cash provided by financing activities 0.0 318.3
Effect of exchange rate changes on cash and cash equivalents (0.1) (0.3)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (34.1) 87.7
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD 325.8 97.2
CASH AND CASH EQUIVALENTS, END OF PERIOD $ 291.7 $ 184.9