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Unconsolidated Affiliates (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended			9 Months Ended
	Jun. 30, 2024	Sep. 30, 2023	Feb. 28, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Investments
Equity in losses				$ 5.0	$ (14.0)
Loss on impairment of investment in unconsolidated affiliate				5.0
Equity method investments				$ 124.0		$ 216.0
Transocean Inc \| Perestroika AS
Investments
Ownership interest (as a percent)				10.00%			11.00%
8.00% Senior Notes due February 2027
Investments
Debt instrument interest rate stated percentage				8.00%
Global Sea Mineral Resources
Investments
Equity method investment payment			$ 10.0
Equity investment non-cash contribution			$ 85.0
Orion/Transocean Norge
Investments
Equity ownership (as a percent)						33.00%
Equity method investments						$ 86.0
Liquila/Deepwater Aquila
Investments
Equity ownership (as a percent)		80.00%			80.00%		20.00%
Value shares issued in asset acquisition		$ 99.0
Newly issued shares in asset acquisition (in shares)		11.9
Liquila/Deepwater Aquila \| Perestroika AS
Investments
Value shares issued in asset acquisition		$ 16.4
Newly issued shares in asset acquisition (in shares)		2.0
Liquila/Deepwater Aquila \| Liquila/Deepwater Aquila \| Perestroika AS
Investments
Equity ownership (as a percent)							13.33%
Orion/Transocean Norge
Investments
Asset acquisition, consideration transferred	$ 431.0
Value shares issued in asset acquisition	$ 297.0
Newly issued shares in asset acquisition (in shares)	55.5
Orion/Transocean Norge \| 8.00% Senior Notes due February 2027
Investments
Debt instrument interest rate stated percentage	8.00%			8.00%
Debt instrument face value	$ 130.0
Orion/Transocean Norge \| Orion/Transocean Norge
Investments
Equity ownership (as a percent)	67.00%
Liquila/Deepwater Aquila
Investments
Value shares issued in asset acquisition		$ 99.0
Newly issued shares in asset acquisition (in shares)		11.9
Liquila/Deepwater Aquila \| Liquila/Deepwater Aquila
Investments
Equity ownership (as a percent)		80.00%			80.00%