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Leases (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended 24 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Sep. 27, 2015
Sep. 30, 2018
Leases [Abstract]        
Sublease income recognized $ 15.5 $ 14.6 $ 11.9  
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross 11,584.0 10,573.3    
Accumulated depreciation 6,664.5 6,039.5    
Assets Held under Financing Leases [Member]        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, gross 94.3 92.7    
Accumulated depreciation 9.0 $ 6.2    
Contract Termination [Member] | Scenario, Forecast [Member]        
Property, Plant and Equipment [Line Items]        
Business Exit Costs       $ 153.7
Restructuring Charges [Member] | Contract Termination [Member]        
Property, Plant and Equipment [Line Items]        
Business Exit Costs $ 15.7