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Debt - UK Bilateral Revolving Credit Facility (Details) - Revolving Credit Facility - UK Bilateral Revolving Credit Facility - GBP (£)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Maximum borrowing capacity £ 140,000,000  
Optional additional commitments £ 125,000,000  
Interest rate 5.50% 2.10%
LIBOR    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate 2.00%