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Other Financial Statement Data (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Other current assets      
Income and other taxes receivable $ 157.6 $ 179.5  
Prepaid expenses 141.3 110.7  
Other 39.8 28.6  
Total other current assets 338.7 318.8  
Other assets      
Restricted cash 9.8 5.4 $ 7.1
MRO inventory 130.0 126.8  
Marketable securities held in trust 725.1 691.7  
Operating Lease, Right-of-Use Asset 192.2 192.1  
Indemnification asset 21.3 40.6  
Nontrade Receivables, Noncurrent 52.7 81.6  
Other 194.7 316.2  
Total other assets 1,325.8 1,454.4  
Accrued liabilities      
Dividends Payable 0.7 20.0  
Payroll and employee benefits 146.7 173.8  
Asset retirement obligations 155.9 154.4  
Customer Funds 456.2 266.9  
Contractual Obligation For Equity Method Investment 6.6 33.9  
Operating Lease, Liability, Current 67.3 67.1  
Other 388.1 365.8  
Accrued liabilities 1,221.5 1,081.9  
Other noncurrent liabilities      
Asset retirement obligations 1,140.5 1,160.8  
Operating Lease, Liability, Noncurrent 126.6 127.0  
Accrued pension and postretirement benefits 138.3 173.6  
Unrecognized tax benefits 42.1 42.1  
Other 213.9 269.5  
Total other noncurrent liabilities $ 1,661.4 $ 1,773.0