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Commitments and Contingent Liabilities (Details) bbl in Millions, $ in Millions, BTU in Trillions	Dec. 31, 2020 USD ($) BTU bbl	Mar. 05, 2020 USD ($)	Dec. 31, 2019 USD ($)
Redelivery commitments:
Redelivery commitments of natural gas \| BTU	9.9
Redelivery commitments of crude oil \| bbl	19.4
Redelivery commitments of NGL and petrochemical products \| bbl	31.1
Operating lease obligations:
Renewal option years for certain leases	20 years
Liabilities, Other than Long-term Debt, Noncurrent [Abstract]
Noncurrent portion of AROs	$ 137.6		$ 126.9
Deferred revenues - non-current portion	198.2		197.0
Liquidity Option liability	0.0	$ 511.9	509.6
Lease liability - non-current portion	320.8		171.6
Derivative liabilities	17.2		7.3
Other	12.8		20.0
Total	686.6		1,032.4
Junior Subordinated Note [Member]
Debt Instrument [Line Items]
Debt obligations	$ 2,650.0
Minimum [Member]
Operating lease obligations:
Term of material lease agreements	5 years
Maximum [Member]
Operating lease obligations:
Term of material lease agreements	30 years
Litigation matters [Member]
Loss Contingencies [Line Items]
Litigation accruals on an undiscounted basis	$ 6.1		$ 0.2