v3.25.2
Restructuring, Reserve (Details) - Project Momentum Restructuring - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Restructuring Reserve [Roll Forward]    
Restructuring Reserve, Beginning Balance $ 21.7 $ 19.6
Charge to Income 45.9 64.6
Cash 50.3 57.5
Non-Cash 6.3 9.2
Restructuring Reserve, Ending Balance 11.0 17.5
Severance & termination related costs    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve, Beginning Balance 7.2 15.4
Charge to Income 4.0 5.2
Cash 3.8 10.6
Non-Cash 0.0 0.0
Restructuring Reserve, Ending Balance 7.4 10.0
Accelerated depreciation & fixed asset write-offs    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve, Beginning Balance 0.0 0.0
Charge to Income 4.2 7.5
Cash 0.0 0.0
Non-Cash 4.2 7.5
Restructuring Reserve, Ending Balance 0.0 0.0
Other restructuring related costs    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve, Beginning Balance 12.4 3.3
Charge to Income 24.5 41.9
Cash 33.6 38.2
Non-Cash   1.5
Non-Cash 0.0  
Restructuring Reserve, Ending Balance 3.3 5.5
IT enablement    
Restructuring Reserve [Roll Forward]    
Restructuring Reserve, Beginning Balance 2.1 0.9
Charge to Income 13.2 10.0
Cash 12.9 8.7
Non-Cash 2.1 0.2
Restructuring Reserve, Ending Balance $ 0.3 $ 2.0