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Other Financial Statement Data (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Other current assets    
Income and other taxes receivable $ 233.0 $ 181.4
Prepaid expenses 92.9 80.4
Other 75.3 65.1
Total other current assets 401.2 326.9
Restricted Cash Equivalents, Noncurrent 7.3 12.3
Other assets    
MRO inventory 137.6 137.7
Marketable securities held in trust 736.2 734.3
Operating Lease, Right-of-Use Asset 133.4 173.1
Indemnification asset 19.7 23.0
Nontrade Receivables, Noncurrent 44.8 52.6
Other 288.3 255.8
Total other assets 1,367.3 1,388.8
Accrued liabilities    
Payroll and employee benefits 205.4 195.5
Asset retirement obligations 212.0 190.2
Receivable Factoring Liability 47.5 0.0
Customer Advances, Current 493.3 287.6
Contractual Obligation For Equity Method Investment 99.9 83.1
Operating Lease, Liability, Current 58.1 64.0
Other 555.4 412.7
Accrued liabilities 1,671.6 1,233.1
Other noncurrent liabilities    
Asset retirement obligations 1,483.2 1,203.7
Operating Lease, Liability, Noncurrent 78.8 109.6
Accrued pension and postretirement benefits 154.7 158.5
Unrecognized tax benefits 42.1 46.4
Other 250.9 235.3
Total other noncurrent liabilities $ 2,009.7 $ 1,753.5