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Acquisitions (Summary Of Purchase Price And Purchase Price Allocation) (Details) - USD ($)
$ in Millions
Jun. 01, 2017
May 12, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]          
Goodwill     $ 2,178.5 $ 2,277.1 $ 2,133.3
PetMatrix [Member]          
Business Acquisition [Line Items]          
Cash consideration $ 255.2        
Cash and cash equivalents 0.2        
Trade receivables 7.8        
Inventories 16.0        
Prepaid expenses and other current assets 0.9        
Property, plant and equipment 0.8        
Goodwill 123.8        
Intangible assets 110.4        
Accounts payable (4.1)        
Accrued wages and salaries (0.1)        
Other current liabilities (0.5)        
Net assets acquired $ 255.2        
GloFish [Member]          
Business Acquisition [Line Items]          
Cash consideration   $ 49.7      
Trade receivables   0.4      
Property, plant and equipment   0.6      
Goodwill   11.2      
Intangible assets   37.8      
Other current liabilities   (0.3)      
Net assets acquired   $ 49.7