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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities      
Net income (loss) $ (1,325.0) $ 41.2 $ 60.4
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Amortization in interest expense 11.1 10.3 10.8
Compensation on equity grants 66.2 60.3 56.3
Depreciation and amortization expense 865.1 971.6 815.9
Impairment of long-lived assets 2,442.8 225.3  
Impairment of goodwill     210.0
Accretion of asset retirement obligations 3.6 4.7 3.7
Increase (decrease) in redemption value of mandatorily redeemable preferred interests     (72.1)
Deferred income tax expense (benefit) (232.7) (87.9) 5.5
Equity (earnings) loss of unconsolidated affiliates (72.6) (39.0) (7.3)
Distributions of earnings received from unconsolidated affiliates 86.8 49.6 20.8
Risk management activities (228.2) 112.8 9.8
(Gain) loss on sale or disposition of business and assets 58.4 71.1 (0.1)
Write-downs of assets [1] 55.6 17.9  
(Gain) loss from financing activities (45.6) 1.4 2.0
(Gain) loss from sale of equity-method investment   (69.3)  
Change in contingent considerations (0.3) 8.7 (8.8)
Changes in operating assets and liabilities, net of business acquisitions:      
Receivables and other assets (25.6) (24.7) (6.2)
Inventories (27.7) (45.0) (13.9)
Accounts payable, accrued liabilities and other liabilities 105.7 35.0 31.6
Interest payable 6.9 45.8 25.6
Net cash provided by operating activities 1,744.5 1,389.8 1,144.0
Cash flows from investing activities      
Outlays for property, plant and equipment (951.6) (2,877.8) (3,114.8)
Proceeds from sale of business and assets 198.7 14.8 256.9
Investments in unconsolidated affiliates (2.7) (266.8) (282.0)
Proceeds from sale of equity-method investment   70.3  
Return of capital from unconsolidated affiliates 13.2 3.5 5.5
Other, net 4.3 (15.9) (12.5)
Net cash used in investing activities (738.1) (3,071.9) (3,146.9)
Debt obligations:      
Proceeds from borrowings under credit facilities 2,195.0 3,100.0 2,235.0
Repayments of credit facilities (1,795.0) (3,800.0) (1,555.0)
Proceeds from borrowings under accounts receivable securitization facility 576.4 944.2 546.6
Repayments of accounts receivable securitization facility (596.4) (854.2) (616.6)
Proceeds from issuance of senior notes 1,000.0 2,500.0 1,000.0
Redemption of senior notes (1,390.6) (749.4)  
Principal payments of finance leases (12.4) (11.5)  
Proceeds from issuance of common stock     689.0
Costs incurred in connection with financing arrangements (9.9) (35.5) (24.7)
Payment of contingent consideration   (317.1)  
Repurchase of shares and units (97.4) (13.9) (4.0)
Sale of ownership interests in subsidiaries   1,619.7  
Purchase of noncontrolling interests in subsidiary     (0.1)
Contributions from noncontrolling interests 41.5 555.3 817.9
Redemption of Preferred Units (125.0)    
Distributions to noncontrolling interests (439.2) (191.7) (70.7)
Partial repurchase of Series A Preferred Stock (45.8)    
Distributions to Partnership unitholders (11.7) (11.3) (11.3)
Dividends paid to common and Series A preferred shareholders (384.2) (953.5) (908.3)
Net cash provided by (used in) financing activities (1,094.7) 1,781.1 2,097.8
Net change in cash and cash equivalents (88.3) 99.0 94.9
Cash and cash equivalents, beginning of period 331.1 232.1 137.2
Cash and cash equivalents, end of period $ 242.8 $ 331.1 $ 232.1
[1] Related to the write-down of certain assets to their recoverable amounts.