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Share capital and reserves - Schedule of Share Capital and Capital Reserve (Details)
€ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2018
EUR (€)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2019
$ / shares
Dec. 31, 2019
EUR (€)
shares
Dec. 31, 2018
$ / shares
Dec. 31, 2018
EUR (€)
shares
Disclosure of classes of share capital [line items]                
Increase (Decrease) Through Vesting Of Other Equity Instruments In Share-Based Payment Transactions, Equity € 0.1 € (0.8) € (0.2) € (0.1)        
Total share capital and capital reserve           € 2,120.3   € 1,762.3
Listing and share transaction costs       € (13.8)   (24.9)   (13.8)
Total net share capital and capital reserve           2,095.4   1,748.5
Ordinary shares                
Disclosure of classes of share capital [line items]                
Total share capital and capital reserve           2,109.7   1,751.7
Founder Preferred shares                
Disclosure of classes of share capital [line items]                
Total share capital and capital reserve           € 10.6   € 10.6
Issued Capital and Capital Reserve | Ordinary shares                
Disclosure of classes of share capital [line items]                
Par value per share (in USD per share) | $ / shares         $ 10   $ 10  
Number of shares issued and fully paid (in shares) | shares           194,542,957   174,229,051
Issued Capital and Capital Reserve | Founder Preferred shares                
Disclosure of classes of share capital [line items]                
Par value per share (in USD per share) | $ / shares         $ 10.00   $ 10  
Number of shares issued and fully paid (in shares) | shares           1,500,000   1,500,000