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Other Financial Statement Data (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Other current assets    
Income and other taxes receivable $ 293.6 $ 126.1
Prepaid expenses 131.6 107.3
Other 90.7 49.1
Total other current assets 515.9 282.5
Restricted Cash Equivalents, Noncurrent 11.1 8.5
Other assets    
MRO inventory 140.0 144.7
Marketable securities held in trust 653.7 731.5
Operating Lease, Right-of-Use Asset 188.7 120.2
Indemnification asset 22.8 21.0
Nontrade Receivables, Noncurrent 31.8 41.5
Other 336.0 307.3
Total other assets 1,384.1 1,374.7
Dividends Payable 3.3 43.6
Accrued liabilities    
Payroll and employee benefits 207.1 235.9
Asset retirement obligations 238.1 222.4
Customer Advances, Current 737.1 437.7
Contractual Obligation For Equity Method Investment 340.6 184.3
Operating Lease, Liability, Current 53.7 59.7
Other 886.2 618.9
Accrued liabilities 2,467.3 1,883.6
Other noncurrent liabilities    
Asset retirement obligations 1,701.1 1,526.9
Operating Lease, Liability, Noncurrent 138.3 64.3
Accrued pension and postretirement benefits 119.8 114.4
Unrecognized tax benefits 30.6 156.6
Other 243.8 239.9
Total other noncurrent liabilities 2,233.6 2,102.1
Servicing Liability $ 1.2 $ 81.1