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Pension and Other Postretirement Benefits - Pension Plan Assets Measured at Fair Value on a Recurring Basis (Details) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
North America      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Actual allocations, index funds 97.20% 96.80%  
Pension plan's assets at fair value $ 127.9 $ 108.2 $ 102.9
Defined Benefit Plan, Fair Value of Plan Assets not Measured at NAV 21.2 21.2  
Defined Benefit Plan, Plan Assets, Amount Measured at Net Asset Value 106.7 87.0  
North America | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value 0.7 4.1  
Defined Benefit Plan, Fair Value of Plan Assets not Measured at NAV 0.7 4.1  
Defined Benefit Plan, Plan Assets, Amount Measured at Net Asset Value 0.0 0.0  
North America | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value 20.5 17.1  
Defined Benefit Plan, Fair Value of Plan Assets not Measured at NAV 20.5 17.1  
Defined Benefit Plan, Plan Assets, Amount Measured at Net Asset Value $ 0.0 $ 0.0  
North America | Equities      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 57.90%    
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 62.00% 64.70%  
North America | Equities | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 0.0 $ 0.0  
North America | Equities | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value 14.3 11.9  
North America | Equities | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 14.3 $ 11.9  
North America | Fixed Income Funds and Bonds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 37.80%    
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 33.30% 30.20%  
North America | Fixed Income Funds and Bonds | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 0.0 $ 0.0  
North America | Fixed Income Funds and Bonds | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value 6.2 5.2  
North America | Fixed Income Funds and Bonds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 6.2 $ 5.2  
North America | Real assets      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 3.30%    
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 1.30% 1.30%  
North America | Cash and Cash Equivalents      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 1.00%    
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 3.40% 3.80%  
North America | Cash and Cash Equivalents | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 0.7 $ 4.1  
North America | Cash and Cash Equivalents | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value 0.0 0.0  
North America | Cash and Cash Equivalents | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 0.7 $ 4.1  
Other international      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Actual allocations, index funds 37.40% 23.70%  
Pension plan's assets at fair value $ 638.9 $ 516.4 $ 507.3
Defined Benefit Plan, Fair Value of Plan Assets not Measured at NAV 476.8 389.4  
Defined Benefit Plan, Plan Assets, Amount Measured at Net Asset Value 162.1 127.0  
Other international | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value 476.8 389.4  
Defined Benefit Plan, Fair Value of Plan Assets not Measured at NAV 476.8 389.4  
Defined Benefit Plan, Plan Assets, Amount Measured at Net Asset Value 0.0 0.0  
Other international | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value 0.0 0.0  
Defined Benefit Plan, Fair Value of Plan Assets not Measured at NAV 0.0 0.0  
Defined Benefit Plan, Plan Assets, Amount Measured at Net Asset Value $ 0.0 $ 0.0  
Other international | Fixed Income Funds and Bonds      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 63.00%    
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 72.70% 75.20%  
Other international | Fixed Income Funds and Bonds | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 350.3 $ 280.4  
Other international | Fixed Income Funds and Bonds | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value 0.0 0.0  
Other international | Fixed Income Funds and Bonds | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 350.3 $ 280.4  
Other international | Liability Hedging Instruments      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 34.40%    
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 24.70% 21.40%  
Other international | Liability Hedging Instruments | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 121.4 $ 91.6  
Other international | Liability Hedging Instruments | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value 0.0 0.0  
Other international | Liability Hedging Instruments | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 121.4 $ 91.6  
Other international | Cash and Cash Equivalents      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 2.60%    
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 2.60% 3.40%  
Other international | Cash and Cash Equivalents | Level 1      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 5.1 $ 17.4  
Other international | Cash and Cash Equivalents | Level 2      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value 0.0 0.0  
Other international | Cash and Cash Equivalents | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan, Actual Plan Asset Allocation [Abstract]      
Pension plan's assets at fair value $ 5.1 $ 17.4