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Other Financial Statement Data (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Other current assets    
Income and other taxes receivable $ 185.6 $ 126.1
Prepaid expenses 163.5 107.3
Other 137.8 49.1
Total other current assets 486.9 282.5
Restricted Cash Equivalents, Noncurrent 9.4 8.5
Other assets    
MRO inventory 148.7 144.7
Marketable securities held in trust 695.8 731.5
Operating Lease, Right-of-Use Asset 154.8 120.2
Indemnification asset 24.9 21.0
Nontrade Receivables, Noncurrent 46.4 41.5
Other 343.9 307.3
Total other assets 1,423.9 1,374.7
Dividends Payable 1.9 43.6
Accrued liabilities    
Payroll and employee benefits 169.0 235.9
Asset retirement obligations 218.0 222.4
Customer Advances, Current 818.4 437.7
Contractual Obligation For Equity Method Investment 250.4 184.3
Operating Lease, Liability, Current 56.1 59.7
Other 606.5 618.9
Accrued liabilities 2,272.7 1,883.6
Other noncurrent liabilities    
Asset retirement obligations 1,553.4 1,526.9
Operating Lease, Liability, Noncurrent 101.6 114.4
Accrued pension and postretirement benefits 127.9 64.3
Unrecognized tax benefits 29.6 156.6
Other 319.8 239.9
Total other noncurrent liabilities 2,132.3 2,102.1
Servicing Liability $ 152.4 $ 81.1