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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
OPERATING ACTIVITIES    
Net income $ 25.5 $ 48.6
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation expense 26.8 23.3
Share-based compensation expense 8.0 5.7
Accretion of discount on the Notes Receivable from ARO (7.0) (7.0)
Equity in earnings of ARO (2.4) (3.3)
Deferred income tax expense 2.0 4.6
Changes in contract liabilities (7.0) (20.8)
Changes in deferred costs 2.2 0.5
Other 1.9 0.3
Changes in other operating assets and liabilities (21.3) 100.8
Contributions to pension plans and other post-retirement benefits (2.4) (1.0)
Net cash provided by operating activities 26.3 151.7
INVESTING ACTIVITIES    
Additions to property and equipment (151.3) (56.3)
Other 0.0 0.1
Net cash used in investing activities (151.3) (56.2)
FINANCING ACTIVITIES    
Other (1.6) 0.0
Net cash used in financing activities (1.6) 0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH (126.6) 95.5
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 635.7 748.5
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD $ 509.1 $ 844.0