Transactions With Total and Total Energies SE - 0.875% Debentures Due 2021 (Details)		1 Months Ended
	Sep. 01, 2020 $ / shares	Jun. 29, 2014	Jul. 04, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jan. 03, 2021 USD ($)	Jun. 30, 2014 USD ($) $ / shares
Related Party Transaction [Line Items]
Debt face amount			$ 558,678,000
Convertible debt:
Related Party Transaction [Line Items]
Debt face amount			424,995,000		$ 487,634,000
0.875% debentures due 2021 | Convertible debt:
Related Party Transaction [Line Items]
Interest rate						0.875%
Debt face amount			$ 0		62,634,000	$ 400,000,000.0
Conversion ratio	0.0251388	0.0205071
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares	$ 39.78					$ 48.76
Debt instrument, repurchase amount					337,400,000
Long-term debt				$ 62,500,000
0.875% debentures due 2021 | Total | Convertible debt:
Related Party Transaction [Line Items]
Debt face amount					$ 250,000,000.0	$ 250,000,000.0
Long-term debt				$ 0