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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
OPERATING ACTIVITIES        
Net income $ 17.0 $ 77.7 $ 38.3 $ 150.7
Adjustments to reconcile net income to net cash provided by (used in) operating activities:        
Depreciation expense 25.8 22.6 73.6 67.4
Amortization     0.0 6.1
Loss on extinguishment of debt 0.0 0.0 29.2 0.0
Gain on asset disposals     (27.9) (137.7)
Accretion of discount on the Notes Receivable from ARO     (21.2) (37.8)
Share-based compensation expense     19.5 11.5
Deferred income tax expense (4.8) 0.4 2.3 7.1
Income (Loss) from Equity Method Investments (2.4) (2.9) (5.0) (15.9)
Net periodic pension and retiree medical income (0.1) (4.0) (0.3) (12.1)
Asset Impairment Charges 0.0 0.0 0.0 34.5
Other     5.5 1.8
Changes in contract liabilities     (3.9) 58.9
Changes in deferred costs     29.3 47.7
Changes in other operating assets and liabilities     90.0 (114.5)
Net cash provided by (used in) operating activities     170.8 (27.7)
INVESTING ACTIVITIES        
Additions to property and equipment     (233.1) (153.1)
Net proceeds from disposition of assets     29.2 146.8
Purchases of short-term investments     0.0 (220.0)
Repayments of note receivable from ARO     0.0 40.0
Net cash used in investing activities     (203.9) (186.3)
FINANCING ACTIVITIES        
Issuance of Second Lien Notes     1,103.0 0.0
Redemption of First Lien Notes     (571.8) 0.0
Payments for share repurchases     (147.4) 0.0
Debt issuance costs     36.7 0.0
Payments related to tax withholdings for share-based awards     (5.2) (2.5)
Consent solicitation fees     0.0 (3.9)
Net cash provided by (used in) financing activities     341.9 (6.4)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH     308.8 (220.4)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD     748.5 644.6
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD $ 1,057.3 $ 424.2 $ 1,057.3 $ 424.2