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Acquisitions and Divestitures Acquisitions (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]          
Asset Impairment Charges     $ 18.9 $ 2.1 $ 72.0
Wincor Nixdorf [Member]          
Business Acquisition [Line Items]          
Shares, Outstanding     29.8    
Phoenix Interactive Design, Inc [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Gross $ 72.9        
Deferred Payments To Acquire Businesses $ 12.6        
Business Acquisition, Percentage of Voting Interests Acquired 100.00%        
Cryptera AS [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Gross   $ 13.0      
Business Acquisition, Percentage of Voting Interests Acquired   100.00%      
Amount of Deferred Payments Related to Acquisition   10.00%      
Cash Paid Per Share [Member] | Wincor Nixdorf [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Share Price     $ 38.98    
Common Shares Provided Per Share [Member] | Wincor Nixdorf [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Share Price     $ 0.434