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Debt - Debt (Details) £ in Millions, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2020 GBP (£) | Mar. 30, 2020 USD ($)
Debt Instruments [Line Items] |  |  |
Line of Credit Facility, Covenant Compliance | Navigators Group was in compliance with all financial covenants. |  |
Club Facility [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Letters of Credit Outstanding, Amount | $ 165 | £ 60 |
Bilateral Facility [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Letters of Credit Outstanding, Amount | £ |  | £ 18 |
Debt Instrument, Unused Borrowing Capacity, Amount | $ 2 |  |
Senior Notes | Senior Note Six Point Zero Percent Due in Two Thousand Nineteen [Member] |  |  |
Debt Instruments [Line Items] |  |  |
Repayment of debt |  |  | $ 500

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