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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
OPERATING ACTIVITIES        
Net income $ (27.3) $ 112.8 $ 21.3 $ 73.0
Adjustments to reconcile net income to net cash provided by (used in) operating activities:        
Depreciation expense 24.5 22.3 47.8 44.8
Amortization     0.0 4.0
Loss on extinguishment of debt 29.2 0.0 29.2 0.0
Gain on asset disposals     (27.9) (137.6)
Accretion of discount on the Notes Receivable from ARO     (14.0) (15.4)
Share-based compensation expense     12.7 6.9
Deferred income tax expense 2.5 7.3 7.1 6.7
Income (Loss) from Equity Method Investments 0.7 (8.7) (2.6) (13.0)
Net periodic pension and retiree medical income (0.1) (4.1) (0.2) (8.1)
Loss on impairment 0.0 34.5 0.0 34.5
Other     2.7 1.2
Changes in contract liabilities     (7.5) 20.9
Changes in deferred costs     6.9 49.5
Changes in other operating assets and liabilities     60.9 (82.4)
Net cash provided by (used in) operating activities     122.6 (114.0)
INVESTING ACTIVITIES        
Additions to property and equipment     (127.3) (99.6)
Net proceeds from disposition of assets     29.1 146.5
Net cash provided by (used in) investing activities     (98.2) 46.9
FINANCING ACTIVITIES        
Issuance of Second Lien Notes     700.0 0.0
Issuance of Second Lien Notes     (571.8) 0.0
Payments for share repurchases     (64.4) 0.0
Debt issuance costs     31.0 0.0
Other     (0.4) (0.2)
Net cash provided by (used in) financing activities     32.4 (0.2)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH     56.8 (67.3)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD     748.5 644.6
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD $ 805.3 $ 577.3 $ 805.3 $ 577.3