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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Operating Activities      
Net income $ 55.3 $ 89.3  
Adjustments to reconcile net income (loss) to net cash provided by (required by) operating activities      
Depreciation and amortization 51.0 39.4  
Deferred and noncurrent income tax charges (credits) 3.7 5.9  
Accretion of asset retirement obligations 0.6 0.6 $ 2.3
Pretax (gains) losses from sale of assets (0.2) (0.1)  
Net (increase) decrease in noncash operating working capital 108.0 (25.7)  
Other operating activities - net 11.4 4.3  
Net cash provided by (required by) operating activities 229.8 113.7  
Investing Activities      
Property additions (53.6) (46.6)  
Payments for acquisition, net of cash acquired (642.1) 0.0  
Proceeds from sale of assets 0.3 0.2  
Other investing activities - net (0.9) (0.8)  
Net cash provided by (required by) investing activities (696.3) (47.2)  
Financing Activities      
Purchase of treasury stock (50.0) (140.6)  
Dividends paid (6.8) 0.0  
Borrowings of debt 892.8 0.0  
Repayments of debt (214.4) (0.3)  
Debt issuance costs (8.8) 0.0  
Amounts related to share-based compensation (5.8) (5.6)  
Net cash provided by (required by) financing activities 607.0 (146.5)  
Net increase (decrease) in cash, cash equivalents, and restricted cash 140.5 (80.0)  
Cash, cash equivalents, and restricted cash at beginning of period 163.6 280.3 280.3
Cash, cash equivalents, and restricted cash at end of period $ 304.1 $ 200.3 $ 163.6