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Financial risk management - Additional Information (Details)
£ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
EUR (€)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Jun. 15, 2018
EUR (€)
Jun. 15, 2018
USD ($)
Dec. 20, 2017
EUR (€)
Dec. 20, 2017
USD ($)
May 03, 2017
EUR (€)
May 03, 2017
USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Repayment of current borrowings in future years     € 8,600,000 € 8,400,000                      
Financial Assets (Financial Liabilities) At Fair Value Through Other Comprehensive Income     (24,500,000) 7,900,000                      
Financial Assets (Liabilities), Net     (1,396,400,000) (1,872,000,000)                      
Financial liabilities at amortised cost     2,367,600,000 2,310,100,000                      
Financial assets at fair value through profit or loss     103,700,000 30,600,000                      
Gross amount of financial instruments as presented upon balance sheet     21,400,000 49,100,000                      
Gross financial liabilities set off against financial assets subject to offsetting, enforceable master netting arrangements or similar agreements     21,400,000 29,800,000                      
Gains (losses) on hedges of net investments in foreign operations, net of tax     € (13,200,000) 3,400,000 € 8,100,000                    
Cross currency interest rate swap where hedge accounting not applied     14.70%                        
Financial assets at amortised cost     € 891,000,000 395,300,000                      
Net financial assets subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position     0 19,300,000                      
Gross financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements     44,900,000 36,900,000                      
Related financial instruments that are offset     21,400,000 29,800,000                      
Net financial liabilities subject to offsetting, enforceable master netting arrangements or similar agreements in statement of financial position     23,500,000 7,100,000                      
Derivatives at fair value through profit or loss     € 1,000,000 4,300,000                      
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     € 5,600,000 € 5,700,000                      
Liquidity risk                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Line of credit facility, maximum borrowing capacity     80,000,000                        
Letters of credit, overdrafts, customer bonds and bank guarantees utilized against the credit facility     € 17,200,000                        
Pound Sterling | Currency risk                              
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     5.30% 1.30% 3.90%                    
US dollar | Currency risk                              
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     2.00% 4.50% 13.90%                    
Swedish Krona | Currency risk                              
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     2.20% 4.10% 2.70%                    
Net Investment Hedge [Member]                              
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 interest charge     € 2,600,000 € 2,500,000                      
Interest rate swap contract [member]                              
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 interest charge     € 500,000 500,000                      
Cross currency interest rate swap | Pound Sterling | Currency 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 interest charge     € 100,000 100,000                      
Foreign exchange forward contract | Pound Sterling | Currency 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     € 1,400,000 1,200,000                      
Foreign exchange forward contract | US dollar | Currency 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     € 2,800,000 2,300,000                      
Foreign exchange forward contract | Swedish Krona | Currency 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     € 1,200,000 € 1,300,000                      
Derivative financial instruments | Foreign exchange forward contract | US dollar | Currency risk                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Percentage of financial instruments designated as hedging instruments     82.70% 85.20%   82.70% 82.70% 85.20% 85.20%            
Financial asset     € 400,000 € 10,600,000                      
Derivative financial instruments | Foreign exchange forward contract | Euro | Currency risk                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Percentage of financial instruments designated as hedging instruments     95.20% 69.50%   95.20% 95.20% 69.50% 69.50%            
Financial asset     € 9,000,000 € 1,100,000                      
Cross currency interest rate swap | Pound Sterling | Currency 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% 1.00%                    
Hedges of net investment in foreign operations [member] | Cross currency interest rate swap                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Gain (loss) on hedge ineffectiveness       € 300,000                      
Hedges of net investment in foreign operations [member] | Cross currency interest rate swap | Pound Sterling                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Percentage of financial instruments designated as hedging instruments     85.30% 82.80%   85.30% 85.30% 82.80% 82.80%            
Hedges of net investment in foreign operations [member] | Cross currency interest rate swap | Pound Sterling | Currency risk                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Risk exposure associated with instruments sharing characteristic, concentration percentage       103.00%       103.00% 103.00%            
Gains (losses) on hedges of net investments in foreign operations, net of tax     € 13,200,000                        
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, percent     1.00%                        
Hedges of net investment in foreign operations [member] | Loans and Borrowings | Pound Sterling | Currency risk                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Risk exposure associated with instruments sharing characteristic, concentration percentage     104.00%     104.00% 104.00%                
Gain on retranslation of loans       € 3,400,000                      
Hedges of net investment in foreign operations [member] | Derivative financial instruments | Cross currency interest rate swap                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Carrying amount of cross currency interest rate swaps     € 2,400,000 21,600,000                      
Change in fair value of outstanding hedging instruments     (13,200,000) 3,700,000                      
Change in value of hedged item     € 13,200,000 € (3,400,000)                      
Average rate of hedging instrument     119.00% 119.00%   119.00% 119.00% 119.00% 119.00%            
Cash flow hedges [member] | Foreign Exchange Forward And Currency Swap Contract [Member]                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Gains (losses) on change in fair value of derivatives     € 4,800,000 € 1,000,000 € 3,500,000                    
Cash flow hedges [member] | Derivative financial instruments | Cross currency interest rate swap                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Carrying amount of cross currency interest rate swaps     (18,500,000) (25,600,000)                      
Change in fair value of outstanding hedging instruments     7,100,000 35,600,000                      
Change in value of hedged item     € (7,100,000) € (35,600,000)                      
Average rate of hedging instrument     111.00% 111.00%   111.00% 111.00% 111.00% 111.00%            
Currency swap contract [member] | Foreign Exchange Forward And Currency Swap Contract [Member]                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Gains (losses) on change in fair value of derivatives     € 13,600,000 € 400,000 € 3,900,000                    
Senior USD Debt [Member]                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Notional amount     € 845,100,000     $ 935,600,000   $ 953,400,000     $ 953,400,000.0   $ 610,000,000   $ 610,000,000
Senior USD Debt [Member] | Net Investment Hedge [Member] | Interest rate swap contract [member]                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Notional amount | £             £ 222.5                
Pound Sterling                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Notional amount | £             £ 222.5   £ 224.7            
2024 fixed rate senior secured notes                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Notional amount                           € 400,000,000  
Interest rate                           3.25% 3.25%
Senior EURO Debt                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Notional amount                   € 558,000,000   € 500,000,000   € 500,000,000  
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% 0.00%                
EUR/USD [Domain] | Foreign exchange forward contract | Derivative financial instruments                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Carrying amount of cross currency interest rate swaps     € 2,100,000 8,400,000                      
Notional amount     220,600,000 224,900,000                      
Change in fair value of outstanding hedging instruments     € 10,500,000 € 14,100,000                      
Average rate of hedging instrument     114.00% 120.00%   114.00% 114.00% 120.00% 120.00%            
GBP/USD [Domain] [Domain] | Foreign exchange forward contract | Derivative financial instruments                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Carrying amount of cross currency interest rate swaps     € (1,700,000) € 2,000,000                      
Notional amount     56,500,000 47,200,000                      
Change in fair value of outstanding hedging instruments     € (700,000) € 4,500,000                      
Average rate of hedging instrument     128.00% 134.00%   128.00% 128.00% 134.00% 134.00%            
GBP/EUR [Domain] | Foreign exchange forward contract | Derivative financial instruments                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Carrying amount of cross currency interest rate swaps     € (8,300,000) € 1,400,000                      
Notional amount     217,400,000 97,400,000                      
Change in fair value of outstanding hedging instruments     € (10,900,000) € 1,900,000                      
Average rate of hedging instrument     112.00% 112.00%   112.00% 112.00% 112.00% 112.00%            
SEKEUR [Domain] | Foreign exchange forward contract | Derivative financial instruments                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Carrying amount of cross currency interest rate swaps     € (300,000) € (600,000)                      
Notional amount     70,100,000 65,600,000                      
Change in fair value of outstanding hedging instruments     € 2,100,000 € 1,500,000                      
Average rate of hedging instrument     9.00% 10.00%   9.00% 9.00% 10.00% 10.00%            
Other currencies [Domain] | Foreign exchange forward contract | Derivative financial instruments                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Carrying amount of cross currency interest rate swaps     € (300,000) € 500,000                      
Notional amount     42,300,000 38,500,000                      
Change in fair value of outstanding hedging instruments     € 200,000 € 800,000                      
Average rate of hedging instrument     21.00% 0.00%   21.00% 21.00% 0.00% 0.00%            
Cash and cash equivalents                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Financial assets at fair value through profit or loss     € 78,700,000 € 30,600,000                      
Financial asset     826,100,000 327,600,000                      
Financial assets at fair value through other comprehensive income     0 0                      
Financial assets at amortised cost     747,400,000 297,000,000                      
Derivatives at fair value through profit or loss     0 0                      
Trade receivables                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Financial assets at fair value through profit or loss     0 0                      
Financial asset     143,600,000 98,300,000                      
Financial assets at fair value through other comprehensive income     0 0                      
Financial assets at amortised cost     143,600,000 98,300,000                      
Derivatives at fair value through profit or loss     0 0                      
Derivative financial instruments                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Financial assets at fair value through profit or loss     0 0                      
Financial asset     21,400,000 49,100,000                      
Financial assets at fair value through other comprehensive income     20,400,000 44,500,000                      
Financial assets at amortised cost     0 0                      
Derivatives at fair value through profit or loss     1,000,000 4,600,000                      
Short-term investments not cash and cash equivalents [Domain]                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Financial assets at fair value through profit or loss     25,000,000                        
Financial asset     25,000,000                        
Loans and Borrowings Excluding Deferred Borrowing Costs [Member]                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Financial liabilities at amortised cost     1,884,200,000 1,775,200,000                      
Financial liabilities     1,884,200,000 1,775,200,000                      
Financial Liabilities At Fair Value Through Other Comprehensive Income     0 0                      
Financial assets at fair value through profit or loss     0 0                      
Financial assets at amortised cost     0 0                      
Derivatives at fair value through profit or loss     0 0                      
Trade and other payables excluding non-financial liabilities                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Financial liabilities at amortised cost     483,400,000 534,900,000                      
Financial liabilities     483,400,000 534,900,000                      
Financial Liabilities At Fair Value Through Other Comprehensive Income     0 0                      
Financial assets at fair value through profit or loss     0 0                      
Financial assets at amortised cost     0 0                      
Derivatives at fair value through profit or loss     0 0                      
Derivative financial instruments                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Financial liabilities at amortised cost     0 0                      
Financial liabilities     44,900,000 36,900,000                      
Financial Liabilities At Fair Value Through Other Comprehensive Income     (44,900,000) (36,600,000)                      
Financial assets at fair value through profit or loss     0 0                      
Financial assets at amortised cost     0 0                      
Derivatives at fair value through profit or loss     0 € 300,000                      
Forecast [Member]                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Repayment based on excess cashflow calculation € 12,100,000 € 0                          
Sell | Interest rate swap contract [member]                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Notional amount     € 309,700,000                        
Pay | Interest rate swap contract [member]                              
Disclosure of nature and extent of risks arising from financial instruments [line items]                              
Notional amount | £             £ 260.8