Other Financial Statement Data (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Other current assets
Income and other taxes receivable	$ 305.1	$ 126.1
Prepaid expenses	167.3	107.3
Other	94.4	49.1
Total other current assets	566.8	282.5
Restricted Cash Equivalents, Noncurrent	8.9	8.5
Other assets
MRO inventory	141.2	144.7
Marketable securities held in trust	679.5	731.5
Operating Lease, Right-of-Use Asset	154.0	120.2
Indemnification asset	24.2	21.0
Nontrade Receivables, Noncurrent	38.0	41.5
Other	334.6	307.3
Total other assets	1,380.4	1,374.7
Dividends Payable	2.5	43.6
Accrued liabilities
Payroll and employee benefits	200.4	235.9
Asset retirement obligations	200.0	222.4
Customer Advances, Current	1,268.0	437.7
Contractual Obligation For Equity Method Investment	285.6	184.3
Operating Lease, Liability, Current	56.6	59.7
Other	710.8	618.9
Accrued liabilities	2,723.9	1,883.6
Other noncurrent liabilities
Asset retirement obligations	1,524.1	1,526.9
Operating Lease, Liability, Noncurrent	100.8	64.3
Accrued pension and postretirement benefits	121.7	114.4
Unrecognized tax benefits	30.5	156.6
Other	240.0	239.9
Total other noncurrent liabilities	2,017.1	2,102.1
Servicing Liability	$ 0.0	$ 81.1