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Acquisitions and Divestitures (Intangible Assets Acquired) (Details) - USD ($)
$ in Millions
Jan. 19, 2018
Dec. 11, 2017
AmeriPride    
Business Acquisition [Line Items]    
Total intangible assets $ 321.0  
AmeriPride | Customer relationship assets    
Business Acquisition [Line Items]    
Weighted-average estimated useful life (in years) 15 years  
Total intangible assets $ 297.0  
AmeriPride | Trade names    
Business Acquisition [Line Items]    
Weighted-average estimated useful life (in years) 3 years  
AmeriPride | Trade names | Trade names    
Business Acquisition [Line Items]    
Total intangible assets $ 24.0  
Avendra    
Business Acquisition [Line Items]    
Total intangible assets   $ 789.0
Avendra | Trade names    
Business Acquisition [Line Items]    
Trade name   222.0
Avendra | Customer relationship assets    
Business Acquisition [Line Items]    
Customer relationship assets   $ 567.0
Weighted-average estimated useful life (in years)   15 years