Supplemental Oil and Gas Information (Unaudited) - Schedule of Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items]
Future cash inflows	$ 25,435.4	$ 27,944.5	$ 39,697.3
Future development costs	(3,103.3)	(2,759.2)	(2,238.3)
Future production costs	(12,013.9)	(12,368.5)	(12,508.5)
Future income taxes	(1,348.1)	(1,813.4)	(4,400.9)
Future net cash flows	8,970.1	11,003.4	20,549.6
10% annual discount for estimated timing of cash flows	(3,574.2)	(4,150.0)	(8,736.4)
Standardized measure of discounted future net cash flows	5,395.9	6,853.4	11,813.2	$ 7,299.0
United States - Offshore
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items]
Future cash inflows	18,118.1	18,927.6	27,277.9
Future development costs	(2,024.9)	(1,685.3)	(1,594.5)
Future production costs	(7,645.7)	(7,856.2)	(8,297.4)
Future income taxes	(893.5)	(1,057.5)	(2,606.8)
Future net cash flows	7,554.0	8,328.6	14,779.2
10% annual discount for estimated timing of cash flows	(2,887.3)	(2,840.6)	(5,709.8)
Standardized measure of discounted future net cash flows	4,666.7	5,488.0	9,069.4
Canada
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items]
Future cash inflows	6,304.4	8,012.7	12,360.2
Future development costs	(825.9)	(769.6)	(642.4)
Future production costs	(4,026.5)	(4,223.6)	(4,199.0)
Future income taxes	(251.2)	(634.6)	(1,788.7)
Future net cash flows	1,200.8	2,384.9	5,730.1
10% annual discount for estimated timing of cash flows	(486.0)	(1,056.9)	(3,015.6)
Standardized measure of discounted future net cash flows	714.8	1,328.0	2,714.5
Other
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items]
Future cash inflows	1,012.9	1,004.2	59.2
Future development costs	(252.5)	(304.3)	(1.4)
Future production costs	(341.7)	(288.7)	(12.1)
Future income taxes	(203.4)	(121.3)	(5.4)
Future net cash flows	215.3	289.9	40.3
10% annual discount for estimated timing of cash flows	(200.9)	(252.5)	(11.0)
Standardized measure of discounted future net cash flows	$ 14.4	$ 37.4	$ 29.3