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Other Financial Statement Data (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Other current assets      
Income and other taxes receivable $ 145.1 $ 179.5  
Prepaid expenses 149.0 110.7  
Other 55.8 28.6  
Total other current assets 349.9 318.8  
Other assets      
Restricted cash 13.9 5.4 $ 8.8
MRO inventory 129.3 126.8  
Marketable securities held in trust 726.7 691.7  
Operating Lease, Right-of-Use Asset 183.7 192.1  
Indemnification asset 21.4 40.6  
Nontrade Receivables, Noncurrent 50.0 81.6  
Other 194.1 316.2  
Total other assets 1,319.1 1,454.4  
Accrued liabilities      
Payroll and employee benefits 171.0 173.8  
Asset retirement obligations 186.1 154.4  
Customer Funds 304.4 266.9  
Contractual Obligation For Equity Method Investment 92.8 33.9  
Operating Lease, Liability, Current 66.2 67.1  
Other 408.2 385.8  
Accrued liabilities 1,228.7 1,081.9  
Other noncurrent liabilities      
Asset retirement obligations 1,183.1 1,160.8  
Operating Lease, Liability, Noncurrent 118.8 127.0  
Accrued pension and postretirement benefits 137.3 173.6  
Unrecognized tax benefits 43.6 42.1  
Other 248.9 269.5  
Total other noncurrent liabilities $ 1,731.7 $ 1,773.0