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Basis of Presentation of the Consolidated Financial Statements - Sale of Share Capital (Details)
€ in Millions, shares in Millions
1 Months Ended 12 Months Ended
Nov. 13, 2017
EUR (€)
shares
Oct. 24, 2017
EUR (€)
shares
Feb. 20, 2017
EUR (€)
shares
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Disclosure of classes of share capital [line items]              
Increase (decrease) in equity through change in equity of equity holders         € 1,843.0 € (7.0) € 2,424.0
Retained earnings              
Disclosure of classes of share capital [line items]              
Increase (decrease) in equity through change in equity of equity holders       € 570.0 449.0   (1,297.0)
Reserve of exchange differences on translation [member]              
Disclosure of classes of share capital [line items]              
Increase (decrease) in equity through change in equity of equity holders       (9.0) (9.0)   628.0
Non-controlling interests              
Disclosure of classes of share capital [line items]              
Increase (decrease) in equity through change in equity of equity holders       € 690.0 € 649.0 € (7.0) € 2,538.0
Telxius Telecom, S.A.              
Disclosure of classes of share capital [line items]              
Percentage of share capital acquired     40.00% 40.00% 40.00%    
Purchase of investment interest     € 1,275.0        
Telxius Telecom, S.A. | KKR              
Disclosure of classes of share capital [line items]              
Number of share options exercised | shares 38   38        
Percentage of share capital acquired 15.20%   15.20% 40.00% 40.00%    
Purchase of investment interest € 484.5   € 484.5 € 1,275.0      
Increase (decrease) in equity through change in equity of equity holders       € 690.0      
KKR | Telxius Telecom, S.A.              
Disclosure of classes of share capital [line items]              
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