v3.26.1
Goodwill and Intangible Assets (Schedule of Amortizable Intangible Assets) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Finite-Lived Intangible Assets [Line Items]          
Amortizable intangible assets, gross carrying amount $ 579,100,000   $ 579,100,000   $ 583,800,000
Amortizable intangible assets, accumulated amortization 341,400,000   341,400,000   327,000,000.0
Amortizable intangible assets, net 237,700,000   237,700,000   256,800,000
Amortization of intangibles 6,200,000 $ 6,400,000 19,100,000 $ 19,200,000  
Amortizable intangible assets, amortization expense, next 12 months 25.1   25.1    
Amortizable intangible assets, amortization expense, year two 25.0   25.0    
Amortizable intangible assets, amortization expense, year 3 25.0   25.0    
Amortizable intangible assets, amortization expense, year 4 24.9   24.9    
Amortizable intangible assets, amortization expense, year 5 18.0   18.0    
Amortizable intangible assets, amortization expense, thereafter 113.4   113.4    
Indefinite-lived intangible assets 568,700,000   568,700,000   571,400,000
Intangible Assets, Gross (Excluding Goodwill) 1,147,800,000   1,147,800,000   1,155,200,000
Other intangible assets, net 806,400,000   806,400,000   828,200,000
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year 6.2   6.2    
Trade names and brands          
Finite-Lived Intangible Assets [Line Items]          
Amortizable intangible assets, gross carrying amount 236,200,000   236,200,000   237,100,000
Amortizable intangible assets, accumulated amortization 84,300,000   84,300,000   77,400,000
Amortizable intangible assets, net 151,900,000   151,900,000   159,700,000
Technology and patents          
Finite-Lived Intangible Assets [Line Items]          
Amortizable intangible assets, gross carrying amount 76,900,000   76,900,000   80,200,000
Amortizable intangible assets, accumulated amortization 75,600,000   75,600,000   78,400,000
Amortizable intangible assets, net 1,300,000   1,300,000   1,800,000
Customer related and other          
Finite-Lived Intangible Assets [Line Items]          
Amortizable intangible assets, gross carrying amount 266,000,000.0   266,000,000.0   266,500,000
Amortizable intangible assets, accumulated amortization 181,500,000   181,500,000   171,200,000
Amortizable intangible assets, net $ 84,500,000   $ 84,500,000   $ 95,300,000