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Financial risk management - Market Risk (Details)
£ in Millions
12 Months Ended
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
Dec. 31, 2021
GBP (£)
Dec. 31, 2020
GBP (£)
Senior GBP Debt          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Notional amount | £       £ 0.0 £ 220.2
Notional amount | £       £ 0.0 £ 220.2
Interest rate risk          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, percent 1.00%        
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on pre-tax earnings € 2,600,000 € 5,600,000      
Liquidity risk          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Line of credit facility, maximum borrowing capacity 175,000,000        
Letters of credit, overdrafts, customer bonds and bank guarantees utilized against the credit facility € 2,800,000        
Currency risk | Pound Sterling          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Sensitivity analysis for types of market risk, actual change in risk variable, percent 7.30% (5.20%) 5.30%    
Currency risk | Pound Sterling | Foreign exchange forward contract          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on pre-tax earnings € 0 € 700,000      
Currency risk | US dollar          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Sensitivity analysis for types of market risk, actual change in risk variable, percent 7.80% (9.60%) 2.00%    
Currency risk | US dollar | Foreign exchange forward contract          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on pre-tax earnings € 0 € 0      
Currency risk | US dollar | Foreign exchange forward contract | Derivative financial instruments          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Percentage of financial instruments designated as hedging instruments 95.10% 87.90%   95.10% 87.90%
Financial assets € 18,800,000        
Financial liabilities   € 28,300,000      
Currency risk | Euro | Foreign exchange forward contract | Derivative financial instruments          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Percentage of financial instruments designated as hedging instruments 77.20% 84.90%   77.20% 84.90%
Financial liabilities € 5,900,000 € 3,100,000      
Currency risk | Swedish Krona          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Sensitivity analysis for types of market risk, actual change in risk variable, percent (1.80%) 3.80% (2.20%)    
Currency risk | Swedish Krona | Foreign exchange forward contract          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on pre-tax earnings € (400,000) € (400,000)      
Bottom of range | Interest rate risk          
Disclosure of nature and extent of risks arising from financial instruments [line items]          
Interest rate 0.00%     0.00%