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Founder Preferred Shares Dividend Reserve (Details)
€ in Millions
6 Months Ended 9 Months Ended 12 Months Ended
Jan. 02, 2019
shares
Jun. 30, 2019
Sep. 30, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
$ / shares
Dec. 31, 2017
EUR (€)
$ / shares
Sep. 30, 2018
EUR (€)
Disclosure of classes of share capital [line items]            
Preference shares, dividend payment terms, weighted average share price, minimum term required     10 days 10 days    
Percentage increase in dividend price 20.00% 20.00%        
Dividends recognised as distributions to owners per share (in dollars per share) | $ / shares       $ 16.7538 $ 16.6516  
Preferred share dividend equivalent (in shares)     140,220,619      
Equity     € 2,494.5 $ 2,059.1 $ 1,852.6 € 2,021.5
Founder Entities | Ordinary shares            
Disclosure of classes of share capital [line items]            
Founder preferred shares annual dividend amount (in shares) | shares 171,092          
Founder preferred shares dividend reserve | Founder Preferred shares            
Disclosure of classes of share capital [line items]            
Equity     € 370.1 $ 372.6