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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Statement of Cash Flows [Abstract] |  |
Cash settlements on commodity hedges derivatives | $ 7.3 | $ (10.0)

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- Definition Represents the amount of cash settlements on commodity derivatives net + References No definition available. + Details
Name: | kos_CashSettlementsOnCommodityDerivativesNet
Namespace Prefix: | kos_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration