Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Intangible assets (Details)

v3.22.2.2
Summary of Significant Accounting Policies - Intangible assets (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Sep. 30, 2022
Sep. 30, 2020
Sep. 30, 2021
Future amortization expense        
2017   $ 52.8    
2018   52.6    
2019   49.9    
2020   49.1    
2021   49.3    
Components of intangible assets and the related accumulated amortization        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     $ 10.2  
Cost   945.7   $ 1,004.7
Accumulated amortization   (352.5)   (317.5)
Other Finite-Lived Intangible Assets, Gross   $ 1,163.2   1,231.3
Minimum        
Components of intangible assets and the related accumulated amortization        
Intangible assets amortization period   3 years    
Maximum        
Components of intangible assets and the related accumulated amortization        
Intangible assets amortization period   21 years    
Trade Names        
Components of intangible assets and the related accumulated amortization        
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 8.6      
Trade names, indefinite lives   $ 217.5   226.6
Customer relationships        
Components of intangible assets and the related accumulated amortization        
Cost   740.6   798.8
Accumulated amortization   (222.0)   (195.4)
Technology, including patents        
Components of intangible assets and the related accumulated amortization        
Cost   132.9   137.6
Accumulated amortization   (68.4)   (62.7)
Software        
Components of intangible assets and the related accumulated amortization        
Cost   72.2   68.3
Accumulated amortization   $ (62.1)   $ (59.4)