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Business Combinations and Acquisitions of Non-Controlling Interests - Sale of Texius Telecom, S.A. (Details)
€ / shares in Units, € in Millions, shares in Millions
1 Months Ended 12 Months Ended
Nov. 13, 2017
EUR (€)
shares
€ / shares
Oct. 24, 2017
EUR (€)
€ / shares
shares
Feb. 20, 2017
EUR (€)
shares
€ / shares
Dec. 31, 2017
EUR (€)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Oct. 31, 2017
Disclosure of detailed information about business combination [line items]                
Increase (decrease) in equity through change in equity of equity holders         € (507.0) € 371.0 € 1,843.0  
Change in translation differences         (258.0) (799.0) (328.0)  
Telxius Telecom, S.A.                
Disclosure of detailed information about business combination [line items]                
Proportion of share capital acquired (as a percent)   40.00% 40.00%          
Purchase of investment interest     € 1,275.0          
Share price (euros per share) | € / shares     € 12.75          
Change in translation differences         € 7.0 € 5.0 (3.0)  
Telxius Telecom, S.A. | KKR                
Disclosure of detailed information about business combination [line items]                
Proportion of share capital acquired (as a percent) 15.20%   15.20%   40.00% 15.20%    
Purchase of investment interest € 484.5   € 484.5 € 1,275.0        
Share price (euros per share) | € / shares € 12.75              
Number of share options exercised | shares 38   38          
Increase (decrease) in equity through change in equity of equity holders       690.0        
KKR | Telxius Telecom, S.A.                
Disclosure of detailed information about business combination [line items]                
Share price (euros per share) | € / shares   € 12.75            
Number of shares exchanged for cash | shares   62 62          
Percent of share capital transferred   0.248 0.248         0.248
Proceeds from exchange of share capital   € 790.5 € 790.5          
Retained earnings                
Disclosure of detailed information about business combination [line items]                
Increase (decrease) in equity through change in equity of equity holders       570.0 € (89.0) € 232.0 449.0  
Change in translation differences         € (258.0) € (799.0) (328.0)  
Retained earnings | Telxius Telecom, S.A. | KKR                
Disclosure of detailed information about business combination [line items]                
Increase (decrease) in equity through appropriation of retained earnings       570.0        
Translation differences                
Disclosure of detailed information about business combination [line items]                
Increase (decrease) in equity through change in equity of equity holders       (9.0)     € (9.0)  
Translation differences | Telxius Telecom, S.A. | KKR                
Disclosure of detailed information about business combination [line items]                
Change in translation differences       € (9.0)