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Redeemable Noncontrolling Interests Redeemable Noncontrolling Interests (Textuals) (Details)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
€ / shares
Dec. 31, 2016
USD ($)
Redeemable Noncontrolling Interests (Textuals) [Line Items]            
Redeemable noncontrolling interests $ 154.2 $ 154.2 $ 485.7 $ 492.1   $ 44.1
Reclassification of noncontrolling interest   $ 0.0 386.7      
Document Period End Date   Sep. 30, 2018        
Shares Repurchased Of Redeemable Noncontrolling Interest | shares 4.8 4.8        
Business Acquisition, Number Of Ordinary Shares Tendered | shares 27.7 27.7        
Business Acquisition, Percentage Tendered Of Ordinary Shares Issued 93.00% 93.00%        
Payments for Repurchase of Redeemable Noncontrolling Interest   $ 308.6 $ 2.7      
Domination and Profit and Loss Transfer Agreement [Member] | Diebold Nixdorf AG [Member]            
Redeemable Noncontrolling Interests (Textuals) [Line Items]            
Redeemable noncontrolling interests $ 136.4 $ 136.4   $ 454.6    
Business Acquisition, Share Price | € / shares         € 55.02  
Recurring Cash Compensation Per Share Net Of Tax | € / shares         € 2.82