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Restructuring and Related Charges - Rollforward of Restructuring Accrual (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning $ 33.6 $ 7.8
Provisions 46.0 34.6
Cash expenditures (64.9) (7.1)
Non-cash items 0.0 (1.7)
Accrual balance at ending 10.5 $ 33.6
Accounting Standards Update [Extensible List]   us-gaap:AccountingStandardsUpdate201602Member
Cumulative Effect, Period of Adoption, Adjustment    
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning (4.2)  
Accrual balance at ending   $ (4.2)
Termination Benefits    
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning 6.6 3.1
Provisions 4.3 7.9
Cash expenditures (7.1) (3.8)
Non-cash items 0.3 (0.6)
Accrual balance at ending 4.1 6.6
Termination Benefits | Cumulative Effect, Period of Adoption, Adjustment    
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning 0.0  
Accrual balance at ending   0.0
Other Costs    
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning 27.0 4.7
Provisions 41.7 26.7
Cash expenditures (57.8) (3.3)
Non-cash items (0.3) (1.1)
Accrual balance at ending 6.4 27.0
Other Costs | Cumulative Effect, Period of Adoption, Adjustment    
Restructuring Reserve [Roll Forward]    
Accrual balance at beginning $ (4.2)  
Accrual balance at ending   $ (4.2)