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Significant Accounting Policies and Practices - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 01, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Significant Accounting Policies [Line Items]            
Impairment loss recognized on definite-lived tangible assets     $ 7.6      
Debt issuance costs     (36.5) $ (33.0)    
Expected returns liability     23.1 19.2    
Shipping and handling costs     258.1 253.7 $ 251.2  
Advertising costs     $ 49.8 34.2 26.0  
Percentage greater than the largest amount of recognized income tax positions which likely of being realized     50.00%      
Exchange losses on foreign currency transactions     $ 10.7 41.2 7.1  
Income from discontinued operations, net of tax     14.0 682.5 445.0  
Adjustment for error corrections     1,415.8 $ 1,728.9 1,589.6 $ 1,946.9
Accounting Standards Update [Extensible List]       us-gaap:AccountingStandardsUpdate201602Member    
Operating lease assets     103.8      
Lease liabilities     $ 111.2      
Operating leases     4.68%      
Accumulated Earnings            
Significant Accounting Policies [Line Items]            
Income from discontinued operations, net of tax     $ 14.0 $ 682.5 411.8  
Adjustment for error corrections     243.9 223.8 (180.1) (925.9)
Adjustment | Return-To-Provision Adjustments            
Significant Accounting Policies [Line Items]            
Income from discontinued operations, net of tax   $ 22.6   22.6    
Adjustment for error corrections       22.6    
Accounting Standards Update 2016-02            
Significant Accounting Policies [Line Items]            
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member          
Operating lease assets $ 107.5          
Lease liabilities 113.0          
Deferred taxes $ 29.7          
Operating leases 4.60%          
Accounting Standards Update 2018-02            
Significant Accounting Policies [Line Items]            
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201802Member          
Reclassification from AOCI to retained earnings $ 0.3          
SB/RH            
Significant Accounting Policies [Line Items]            
Debt issuance costs     (36.5) (31.5)    
Income from discontinued operations, net of tax     14.0 682.5 (24.0)  
Adjustment for error corrections     1,265.2 1,434.7 1,611.7 1,835.4
Operating lease assets     103.8      
SB/RH | Accumulated Earnings            
Significant Accounting Policies [Line Items]            
Income from discontinued operations, net of tax     14.0 682.5 (24.0)  
Adjustment for error corrections     $ (614.2) (414.7) $ (235.5) $ (42.8)
SB/RH | Adjustment | Return-To-Provision Adjustments            
Significant Accounting Policies [Line Items]            
Income from discontinued operations, net of tax       22.6    
Adjustment for error corrections       $ 22.6