CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net income (loss)	$ 168.6	$ 227.9
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization in interest expense	2.4	2.7
Compensation on equity grants	13.5	15.0
Depreciation and amortization expense	209.1	216.2
(Gain) loss on sale or disposition of assets	(1.0)
Write-downs of assets	0.5	3.5
Accretion of asset retirement obligations	1.1	0.9
Increase (decrease) in redemption value of mandatorily redeemable preferred interests	(0.7)
Deferred income tax expense (benefit)	21.1	14.5
Equity (earnings) loss of unconsolidated affiliates	(5.6)	(11.8)
Distributions of earnings received from unconsolidated affiliates	6.0	24.3
Risk management activities	178.2	(1.5)
(Gain) loss from financing activities	15.8	14.7
Changes in operating assets and liabilities:
Receivables and other assets	(216.2)	(41.9)
Inventories	55.9	139.9
Accounts payable, accrued liabilities and other liabilities	363.5	121.2
Interest payable	(64.0)	(45.8)
Net cash provided by operating activities	748.2	679.8
Cash flows from investing activities
Outlays for property, plant and equipment	(204.4)	(96.2)
Proceeds from sale of assets	1.0
Investments in unconsolidated affiliates	(0.4)
Return of capital from unconsolidated affiliates	6.8	5.9
Other, net		0.3
Net cash used in investing activities	(197.0)	(90.0)
Debt obligations:
Proceeds from borrowings under credit facilities	1,805.0	65.0
Repayments of credit facilities	(810.0)	(825.0)
Proceeds from borrowings under accounts receivable securitization facility	250.0	350.0
Repayments of accounts receivable securitization facility	(130.0)	(430.0)
Proceeds from issuance of senior notes		1,000.0
Redemption of senior notes	(480.7)	(548.1)
Principal payments of finance leases	(3.2)	(3.1)
Costs incurred in connection with financing arrangements	(10.9)	(9.0)
Repurchase of shares	(72.2)	(8.6)
Contributions from noncontrolling interests	2.9	2.0
Distributions to noncontrolling interests	(90.4)	(129.3)
Repurchase of noncontrolling interests	(926.3)
Dividends paid to common and Series A Preferred shareholders	(108.0)	(48.0)
Net cash provided by (used in) financing activities	(573.8)	(584.1)
Net change in cash and cash equivalents	(22.6)	5.7
Cash and cash equivalents, beginning of period	158.5	242.8
Cash and cash equivalents, end of period	$ 135.9	$ 248.5