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Other Financial Statement Data (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Other current assets      
Income and other taxes receivable $ 217.9 $ 181.4  
Prepaid expenses 107.9 80.4  
Other 119.3 65.1  
Total other current assets 445.1 326.9  
Other assets      
Restricted Cash Equivalents, Current 10.6 12.3 $ 8.5
MRO inventory 133.8 137.7  
Marketable securities held in trust 733.9 734.3  
Operating Lease, Right-of-Use Asset 147.8 173.1  
Indemnification asset 22.2 23.0  
Nontrade Receivables, Noncurrent 51.3 52.6  
Other 284.1 255.8  
Total other assets 1,383.7 1,388.8  
Accrued liabilities      
Payroll and employee benefits 186.0 195.5  
Asset retirement obligations 174.8 190.2  
Receivable Factoring Liability (28.1) 0.0  
Customer Advances, Current 881.4 287.6  
Contractual Obligation For Equity Method Investment 91.4 83.1  
Operating Lease, Liability, Current 62.9 64.0  
Other 462.8 412.7  
Accrued liabilities 1,887.4 1,233.1  
Other noncurrent liabilities      
Asset retirement obligations 1,244.6 1,203.7  
Operating Lease, Liability, Noncurrent 88.0 109.6  
Accrued pension and postretirement benefits 164.7 158.5  
Unrecognized tax benefits 42.9 46.4  
Other 238.4 235.3  
Total other noncurrent liabilities $ 1,778.6 $ 1,753.5