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Other Financial Statement Data (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Other current assets      
Income and other taxes receivable $ 165.5 $ 181.4  
Prepaid expenses 89.4 80.4  
Other 68.1 65.1  
Total other current assets 323.0 326.9  
Other assets      
Restricted cash 4.3 12.3 $ 4.1
MRO inventory 135.2 137.7  
Marketable securities held in trust 729.9 734.3  
Operating Lease, Right-of-Use Asset 154.4 173.1  
Indemnification asset 21.0 23.0  
Nontrade Receivables, Noncurrent 46.8 52.6  
Other 255.2 255.8  
Total other assets 1,346.8 1,388.8  
Accrued liabilities      
Payroll and employee benefits 130.7 195.5  
Asset retirement obligations 188.7 190.2  
Customer Funds 352.8 287.6  
Contractual Obligation For Equity Method Investment 68.6 83.1  
Operating Lease, Liability, Current 61.4 64.0  
Other 392.6 412.7  
Accrued liabilities 1,281.4 1,233.1  
Other noncurrent liabilities      
Asset retirement obligations 1,182.2 1,203.7  
Operating Lease, Liability, Noncurrent 96.3 109.6  
Accrued pension and postretirement benefits 149.7 158.5  
Unrecognized tax benefits 47.6 46.4  
Other 231.4 235.3  
Total other noncurrent liabilities $ 1,707.2 1,753.5  
Structured accounts payable arrangements   $ 640.0