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Commitments - Non-cancellable Operating Lease Rentals (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis of commitments [line items]    
Minimum lease payments payable under non-cancellable agreements 8.7 7.5
Less than one year    
Disclosure of maturity analysis of commitments [line items]    
Minimum lease payments payable under non-cancellable agreements 2.2 1.9
Between one and three years    
Disclosure of maturity analysis of commitments [line items]    
Minimum lease payments payable under non-cancellable agreements 4.1 3.5
Between three and five years    
Disclosure of maturity analysis of commitments [line items]    
Minimum lease payments payable under non-cancellable agreements 2.2 2.0
More than five years    
Disclosure of maturity analysis of commitments [line items]    
Minimum lease payments payable under non-cancellable agreements 0.2 0.1