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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Aug. 26, 2018
Jun. 30, 2019
Jun. 30, 2019
Oct. 01, 2018
Sep. 30, 2018
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
Deferred Revenue, Current   $ 1,300.2 $ 1,300.2 $ 1,220.9 $ 1,642.9
Deferred Revenue, Noncurrent   6,717.9 6,717.9 6,839.7 $ 6,775.7
Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member]          
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
Deferred Revenue, Current   1,100.0 1,100.0 906.6  
Deferred Revenue, Noncurrent   73.4 73.4 $ 64.0  
Company-operated stores [Member] | Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member]          
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
Contract with Customer, Liability, Revenue Recognized   28.9 101.2    
Licensed stores [Member] | Revenue Recognition Period Stored Value Cards and Loyalty Program Breakage [Member]          
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
Contract with Customer, Liability, Revenue Recognized   3.5 12.8    
Nestle Global Coffee Alliance [Member]          
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]          
Deferred Revenue $ 7,000.0        
Prepaid Royalty Economic Life 40 years        
Deferred Revenue, Current   174.0 174.0    
Deferred Revenue, Noncurrent   $ 6,600.0 $ 6,600.0