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Revenue Recognition - Disaggregated Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 274.5 $ 292.4
Restaurant sales    
Disaggregation of Revenue [Line Items]    
Total operating revenues 257.8 273.8
Restaurant Group    
Disaggregation of Revenue [Line Items]    
Total operating revenues 257.8 273.8
Restaurant Group | Restaurant sales    
Disaggregation of Revenue [Line Items]    
Total operating revenues 245.3 259.2
Restaurant Group | Bakery sales    
Disaggregation of Revenue [Line Items]    
Total operating revenues 11.0 13.2
Restaurant Group | Franchise and other    
Disaggregation of Revenue [Line Items]    
Total operating revenues 1.5 1.4
T-System | T-System, point-in-time    
Disaggregation of Revenue [Line Items]    
Total operating revenues 4.8 6.7
T-System | T-System, over time    
Disaggregation of Revenue [Line Items]    
Total operating revenues 7.4 8.7
Corporate and Other | Real estate and resort    
Disaggregation of Revenue [Line Items]    
Total operating revenues 4.4 2.9
Corporate and Other | Other    
Disaggregation of Revenue [Line Items]    
Total operating revenues 0.1 0.3
Total Other Operating Revenue    
Disaggregation of Revenue [Line Items]    
Total operating revenues $ 16.7 $ 18.6