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Acquisition (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sep. 30, 2017
Business Acquisition [Line Items]            
Acquisitions, net of cash acquired       $ 90.2 $ 34.0  
Goodwill   $ 1,450.7   1,450.7   $ 1,445.9
Jack Black integration costs   2.3 $ 0.0 4.9 $ 0.0  
Jack Black            
Business Acquisition [Line Items]            
Acquisition date Mar. 01, 2018          
Acquisitions, net of cash acquired $ 90.2          
Net assets   93.9   93.9    
Working capital and other net assets   11.9   11.9    
Cash acquired   3.7   3.7    
Finite-lived intangible assets   47.7   47.7    
Goodwill   $ 34.3   34.3    
Weighted-average useful life of acquired finite-lived intangible assets   16 years 7 months 6 days        
Selling, general and administrative expense | Jack Black            
Business Acquisition [Line Items]            
Jack Black integration costs   $ 0.5   $ 3.1    
Cost of products sold | Jack Black            
Business Acquisition [Line Items]            
Jack Black integration costs   $ 1.8