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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, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Disclosure of detailed information about business combination [line items]              
Increase (decrease) in equity through change in equity of equity holders         € 1,843.0 € (7.0) € 2,424.0
Telxius Telecom, S.A.              
Disclosure of detailed information about business combination [line items]              
Percentage of share capital acquired     40.00% 40.00% 40.00%    
Purchase of investment interest     € 1,275.0        
Share price (euros per share) | € / shares     € 12.75        
Increase (decrease) in equity through change in translation differences         € (3.0)    
Telxius Telecom, S.A. | KKR              
Disclosure of detailed information about business combination [line items]              
Percentage of share capital acquired 15.20%   15.20% 40.00% 40.00%    
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        
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 € 449.0   (1,297.0)
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)   € 628.0
Translation differences | Telxius Telecom, S.A. | KKR              
Disclosure of detailed information about business combination [line items]              
Increase (decrease) in equity through change in translation differences       € (9.0)