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Redeemable Noncontrolling Interests Redeemable Noncontrolling Interests (Textuals) (Details)
shares in Millions, $ in Millions
1 Months Ended 6 Months Ended
Aug. 31, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
€ / shares
Dec. 31, 2016
USD ($)
Redeemable Noncontrolling Interests (Textuals) [Line Items]            
Redeemable noncontrolling interests   $ 468.6 $ 449.0 $ 492.1   $ 44.1
Reclassification of noncontrolling interest   $ 0.0 386.7      
Document Period End Date   Jun. 30, 2018        
Payments for Repurchase of Redeemable Noncontrolling Interest   $ 3.3 $ 2.6      
Domination and Profit and Loss Transfer Agreement [Member] | Diebold Nixdorf AG [Member]            
Redeemable Noncontrolling Interests (Textuals) [Line Items]            
Redeemable noncontrolling interests   $ 439.2   $ 454.6    
Business Acquisition, Share Price | € / shares         € 55.02  
Recurring Cash Compensation Per Share Net Of Tax | € / shares         € 2.82  
Subsequent Event [Member]            
Redeemable Noncontrolling Interests (Textuals) [Line Items]            
Shares Repurchased Of Redeemable Noncontrolling Interest | shares 2.4          
Payments for Repurchase of Redeemable Noncontrolling Interest $ 160.0