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Condensed Consolidated Statements Of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
OPERATING ACTIVITIES    
Net income (loss) $ 48,600,000 $ (39,800,000)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Depreciation expense 23,300,000 22,500,000
Accretion of discount on the Notes Receivable from ARO (7,000,000.0) (7,700,000)
Share-based compensation expense 5,700,000 3,400,000
Deferred Income Tax Expense (Benefit) 4,600,000 (600,000)
Amortization, Net (4,200,000) 1,600,000
Income (Loss) from Equity Method Investments (3,300,000) (4,300,000)
Net periodic pension and retiree medical income (100,000) (4,000,000.0)
Gain on asset disposals (100,000) (2,500,000)
Other 100,000 500,000
Changes in operating assets and liabilities 85,100,000 32,500,000
Contributions to pension plans and other post-retirement benefits 1,000,000.0 800,000
Net cash provided by operating activities 151,700,000 800,000
INVESTING ACTIVITIES    
Additions to property and equipment (56,300,000) (38,500,000)
Net proceeds from disposition of assets 100,000 1,300,000
Net cash used in investing activities (56,200,000) (37,200,000)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH 95,500,000 (36,400,000)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 748,500,000 644,600,000
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD $ 844,000,000.0 $ 608,200,000