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Debt - UK Bilateral Revolving Credit Facility (Details) - Revolving Credit Facility - UK Bilateral Revolving Credit Facility £ in Thousands | May 25, 2021 extension | May 24, 2021 | Sep. 30, 2021 GBP (£)
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Debt Instrument [Line Items] |  |  |
Number of extensions | extension | 2 |  |
Period of extension | 1 year |  |
Maximum borrowing capacity |  |  | £ 140,000
Additional borrowing capacity |  |  | £ 125,000
Interest rate at period end |  |  | 2.10%
London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, basis spread on variable rate | 2.00% | 2.25% |

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