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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities    
Net income (loss) $ 383.3 $ (1,643.2)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Amortization in interest expense 5.3 5.6
Compensation on equity grants 29.9 33.1
Depreciation and amortization expense 428.0 443.6
Impairment of long-lived assets   2,442.8
Accretion of asset retirement obligations 2.0 1.7
Deferred income tax expense (benefit) 20.3 (301.7)
Equity (earnings) loss of unconsolidated affiliates (24.6) (35.5)
Distributions of earnings received from unconsolidated affiliates 42.2 44.5
Risk management activities 68.2 (125.9)
(Gain) loss on sale or disposition of business and assets (0.2)  
Write-downs of assets 4.7  
(Gain) loss from financing activities 16.6 (61.1)
Changes in operating assets and liabilities:    
Receivables and other assets 31.1 241.3
Inventories 126.2 (56.7)
Accounts payable, accrued liabilities and other liabilities 166.1 (268.8)
Interest payable 4.5 19.2
Net cash provided by operating activities 1,303.6 738.9
Cash flows from investing activities    
Outlays for property, plant and equipment (198.9) (615.9)
Proceeds from sale of business and assets 0.7 134.8
Investments in unconsolidated affiliates (0.4) (1.4)
Return of capital from unconsolidated affiliates 11.7 6.9
Other, net 1.0 3.5
Net cash used in investing activities (185.9) (472.1)
Debt obligations:    
Proceeds from borrowings under credit facilities 480.0 1,240.0
Repayments of credit facilities (1,145.0) (800.0)
Proceeds from borrowings under accounts receivable securitization facility 530.0 226.4
Repayments of accounts receivable securitization facility (520.0) (346.4)
Proceeds from issuance of senior notes 1,000.0  
Redemption of senior notes (1,132.0) (239.8)
Principal payments of finance leases (6.2) (6.2)
Costs incurred in connection with financing arrangements (9.6) (0.5)
Repurchase of shares and units under compensation plans (8.6) (3.4)
Contributions from noncontrolling interests 4.1 25.7
Distributions to noncontrolling interests (251.5) (206.2)
Distributions to Partnership unitholders   (5.6)
Dividends paid to common and Series A Preferred shareholders (92.7) (285.7)
Net cash provided by (used in) financing activities (1,151.5) (401.7)
Net change in cash and cash equivalents (33.8) (134.9)
Cash and cash equivalents, beginning of period 242.8 331.1
Cash and cash equivalents, end of period $ 209.0 $ 196.2