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Basis of preparation Impact of change in accounting standard IFRS16 (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure of initial application of standards or interpretations [line items]        
Disclosure of maturity analysis of operating lease payments [text block] 7600000 181600000    
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16   2.90%    
Property, plant and equipment € 350,000,000 € 348,800,000 € 295,400,000  
Lease liabilities 109,000,000      
Other provisions 46,800,000 113,700,000 140,800,000 € 46,800,000
Accumulated deficit reserve (11,800,000) (167,900,000)    
Profit (loss) before tax 210,300,000 227,100,000 168,500,000  
Depreciation, right-of-use assets € 16,100,000 € 0 € 0  
Impact on Earnings per share € 0.80 € 0.97 € 0.78  
Loans and borrowings € 1,847,600,000 € 1,742,900,000    
Current 40,900,000 44,300,000    
Provisions 5,900,000 69,400,000    
Trade and other payables 527,900,000 € 572,900,000    
Bjuv Facility [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16   6.30%    
IFRS 16 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment   € 432,700,000    
Lease liabilities   120,800,000    
Other provisions   (46,800,000)    
Accumulated deficit reserve   (136,600,000)    
Current borrowings   41,800,000    
Loans and borrowings   1,843,300,000    
Current   40,700,000    
Provisions   6,100,000    
Trade and other payables   € (1,300,000)    
Previously stated [member] | IFRS 16 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Disclosure of maturity analysis of operating lease payments [text block]   181600000    
Property, plant and equipment   € 348,800,000    
Accumulated deficit reserve   (167,900,000)    
Current borrowings   21,400,000    
Loans and borrowings   1,742,900,000    
Current   44,300,000    
Provisions   69,400,000    
Trade and other payables   0    
Increase (decrease) due to changes in accounting policy required by IFRSs [member] | IFRS 16 [Member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment   83,900,000    
Lease liabilities   120,800,000    
Other provisions   (66,900,000)    
Impairment review of lease assets on transition to IFRS 16   35,600,000    
Accumulated deficit reserve   31,300,000    
Profit (loss) before tax 2,800,000.0      
Adjusted EBITDA 17,700,000.0      
Depreciation, right-of-use assets € 16,100,000.0      
Impact on Earnings per share € 0.01      
Discounted using the incremental borrowing rate       € (54,900,000)
Less: short-term and low value leases recognized on a straight-line basis as expense   2,000,000    
Less: contracts assessed as service agreements   8,100,000    
Add: adjustments as a result of a different treatment of extension and termination options   (4,200,000)    
Current borrowings   (20,400,000)    
Loans and borrowings   100,400,000    
Current   3,600,000    
Provisions   (63,300,000)    
Trade and other payables   € (1,300,000)