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Acquisitions Business Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 17, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Business Combination Segment Allocation [Line Items]            
Business Combination Acquisition And Integration Related Costs   $ 5.8 $ 8.0 $ 15.0 $ 31.2  
Document Period End Date       Jun. 30, 2017    
Goodwill   2,621.3   $ 2,621.3   $ 2,478.4
Hhi Business [Member]            
Business Combination Segment Allocation [Line Items]            
Business Combination Acquisition And Integration Related Costs   1.8 4.4 5.7 12.0  
Petmatrix LLC [Member]            
Business Combination Segment Allocation [Line Items]            
Business Combination Acquisition And Integration Related Costs   1.7 0.0 2.0 0.0  
Business Combination, Consideration Transferred $ 255.2          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   0.2   0.2    
Goodwill   123.8   123.8    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables   7.8   7.8    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory   16.0   16.0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   0.8   0.8    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   110.4   110.4    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets   0.9   0.9    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable   (4.7)   (4.7)    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   255.2   255.2    
GloFish [Member]            
Business Combination Segment Allocation [Line Items]            
Business Combination Acquisition And Integration Related Costs   0.8 0.0 0.8 0.0  
Payments to Acquire Businesses, Gross       49.7    
Business Combination, Consideration Transferred       53.9    
Goodwill   15.4   15.4    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables   0.4   0.4    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   0.6   0.6    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   37.8   37.8    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable   (0.3)   (0.3)    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net   53.9   53.9    
Business Combination, Consideration Transferred, Liabilities Incurred       4.2    
AAG Acquisition [Member]            
Business Combination Segment Allocation [Line Items]            
Business Combination Acquisition And Integration Related Costs   0.6 2.6 3.0 13.2  
Shaser, Inc. [Member]            
Business Combination Segment Allocation [Line Items]            
Business Combination Acquisition And Integration Related Costs   0.2 0.0 $ 1.4 0.0  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Description       0.44    
Business Combination, Consideration Transferred       $ 12.6    
Others [Member]            
Business Combination Segment Allocation [Line Items]            
Business Combination Acquisition And Integration Related Costs   $ 0.7 $ 1.0 $ 2.1 $ 6.0