Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items]
Deferred tax assets, net of valuation allowance	$ 248.8		$ 248.8
Deferred tax liabilities	7.8		7.8
Valuation allowance	18.5		18.5
Reserves for uncertain tax positions	183.6		183.6		$ 202.3
Uncertain tax positions, related tax benefits	0.1		0.1		$ 0.1
New uncertain tax positions			6.9
Foreign Tax Authority | Guyana and Luxembourg
Effective Income Tax Rate Reconciliation [Line Items]
Deferred foreign tax benefits	63.1
Foreign Tax Authority | Guyana, Luxembourg, Switzerland, and Nigeria
Effective Income Tax Rate Reconciliation [Line Items]
Deferred foreign tax benefits			81.6
Tax expenses related to various recurring items	57.8		59.3
Foreign Tax Authority | Guyana, Norway, Switzerland, and Luxembourg
Effective Income Tax Rate Reconciliation [Line Items]
Deferred foreign tax benefits		$ 50.7
Foreign Tax Authority | Guyana
Effective Income Tax Rate Reconciliation [Line Items]
Deferred foreign tax benefits				$ 84.6
Foreign Tax Authority | Norway
Effective Income Tax Rate Reconciliation [Line Items]
Deferred foreign tax benefits				3.9
Foreign Tax Authority | Switzerland
Effective Income Tax Rate Reconciliation [Line Items]
Deferred foreign tax benefits				$ 7.2
Foreign Tax Authority | Luxembourg
Effective Income Tax Rate Reconciliation [Line Items]
Deferred foreign tax benefits	$ 63.1
Foreign Tax Authority | Nigeria, Switzerland, and Luxembourg
Effective Income Tax Rate Reconciliation [Line Items]
Deferred foreign tax benefits			$ 81.6