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Segment Information - Narrative (Details)
record in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
segment
sites
customer
Dec. 31, 2018
record
Oct. 16, 2017
Segment Reporting Information [Line Items]      
Number of business records (more than) | record   300  
Ceridian      
Segment Reporting Information [Line Items]      
Ownership interest, equity method investment (as a percent) 23.30%    
ABRH      
Segment Reporting Information [Line Items]      
Ownership interest, controlling interest (as percent) 65.40%    
99 Restaurants      
Segment Reporting Information [Line Items]      
Ownership interest, controlling interest (as percent) 88.50%    
T-System      
Segment Reporting Information [Line Items]      
Ownership interest, controlling interest (as percent)     97.00%
Number of businesses | segment 2    
T-System | T-System Coding Software & Outsourced Solutions      
Segment Reporting Information [Line Items]      
Number of customers (more than) | customer 75    
Number of sites | sites 400    
T-System | Software Solutions | T-System Clinical Documentation      
Segment Reporting Information [Line Items]      
Number of customers (more than) | customer 240    
Number of sites | sites 450    
T-System | T-Sheet | T-System Clinical Documentation      
Segment Reporting Information [Line Items]      
Number of customers (more than) | customer 200    
Number of sites | sites 475