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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
OPERATING ACTIVITIES      
Net loss $ (4,857.6) $ (192.2) $ (636.6)
Adjustments to reconcile net loss to net cash used in operating activities of continuing operations:      
Debtor in Possession financing fees and payments on Backstop Agreement 40.0 0.0 0.0
Asset Impairment Charges 3,646.2 104.0 40.3
Depreciation expense 540.8 609.7 478.9
Reorganization items (non-cash) 436.4 0.0 0.0
Deferred income tax expense (105.7) 23.9 56.6
(Gain on) adjustment to bargain purchase (6.3) 637.0 1.8
Amortization of Debt Discount (Premium) 36.8 31.5 (7.2)
Share-based compensation expense 21.4 37.3 29.9
Equity in losses of ARO 7.8 12.6 0.0
Amortization, Net 6.2 (16.8) (40.2)
(Gain) loss on debt extinguishment (3.1) (194.1) 19.0
Other 6.9 9.9 26.2
Changes in operating assets and liabilities, net of acquisition (22.0) (52.5) (20.8)
Contributions to pension plans and other post-retirement benefits (12.1) (13.2) 0.0
Net Cash Provided by (Used in) Operating Activities, Total (251.7) (276.9) (55.7)
INVESTING ACTIVITIES      
Additions to property and equipment (93.8) (227.0) (426.7)
Net proceeds from disposition of assets 51.8 17.7 11.0
Acquisition of Rowan, net of cash acquired 0.0 931.9 0.0
Maturities of short-term investments 0.0 474.0 1,030.0
Purchases of short-term investments 0.0 (145.0) (919.0)
Net Cash Provided by (Used in) Investing Activities, Total (42.0) 1,051.6 (304.7)
FINANCING ACTIVITIES      
Borrowings on credit facility 596.0 215.0 0.0
Payments for Debtor-in-possession financing fees and backstop agreement (40.0) 0.0 0.0
Repayments of credit facility borrowings (15.0) (215.0) 0.0
Reduction of long-term borrowings (9.7) (928.1) (771.2)
Payments to Noncontrolling Interests (7.2) 0.0 0.0
Payments of Financing Costs 0.0 9.5 0.0
Cash dividends paid 0.0 (4.5) (17.9)
Proceeds from issuance of senior notes 0.0 0.0 1,000.0
Debt issuance costs 0.0 0.0 (17.0)
Other (1.9) (10.2) (5.7)
Net cash provided by (used in) financing activities 522.2 (952.3) 188.2
Net cash provided by discontinued operations 0.0 0.0 2.5
Effect of exchange rate changes on cash and cash equivalents 0.1 (0.3) (0.6)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 228.6 (177.9) (170.3)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 97.2 275.1 445.4
CASH AND CASH EQUIVALENTS, END OF YEAR $ 325.8 $ 97.2 $ 275.1