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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
OPERATING ACTIVITIES    
Net income (loss) $ (39.2) $ 25.5
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation expense 33.1 26.8
Accretion of discount on the Notes Receivable from ARO (6.1) (7.0)
Share-based compensation expense 5.6 8.0
Equity in earnings of ARO (2.6) (2.4)
Deferred income tax expense 169.8 2.0
Net (gain) loss on sale of property (27.1) 0.1
Loss on impairment 7.8 0.0
Changes in contract liabilities (17.8) (7.0)
Changes in deferred costs (0.2) 2.2
Other 2.3 1.8
Changes in operating assets and liabilities 35.3 (21.3)
Contributions to pension plans and other post-retirement benefits (5.0) (2.4)
Net cash provided by operating activities 155.9 26.3
INVESTING ACTIVITIES    
Additions to property and equipment (100.2) (151.3)
Proceeds from disposition of assets 17.8 0.0
Net cash used in investing activities (82.4) (151.3)
FINANCING ACTIVITIES    
Other (0.3) (1.6)
Net cash used in financing activities (0.3) (1.6)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 73.2 (126.6)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 380.5 635.7
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD $ 453.7 $ 509.1