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Retirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]      
Shares of common stock in ESOP 1,690,227    
Defined contribution plan cost recognized $ 82.6 $ 71.5 $ 60.6
Pension and postretirement benefits, current $ 11.3 9.6  
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Expected return on plan assets 5.80%    
International      
Defined Benefit Plan Disclosure [Line Items]      
Expected return on plan assets 4.30%    
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Expected return on plan assets 4.30%    
Percentage of plan assets as component of total international plan assets 80.00%    
Defined Benefit Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Pension settlement loss $ 2.3 2.0 6.2
ABO for all defined benefit pension plans 3,860.4 3,429.1  
ABO for plans with obligation in excess plan assets 55.4    
PBO for plans with obligation in excess of plan assets 59.9    
Company contributions 34.7    
Defined Benefit Pension Plan | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Anticipated contributions for next fiscal year 30.0    
Defined Benefit Pension Plan | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Anticipated contributions for next fiscal year 40.0    
Defined Benefit Pension Plan | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Pension settlement loss $ 1.1 1.4 $ 6.0
Amortization period based on approximate average remaining service period 6 years    
ABO for plans with obligation in excess plan assets $ 2,394.5 47.1  
PBO for plans with obligation in excess of plan assets $ 2,446.5 $ 2,194.5  
Expected return on plan assets 5.80% 5.80% 5.80%
Company contributions $ 7.3 $ 8.4  
Obligation at end of year 2,613.1 2,348.8 $ 2,450.8
Pension and postretirement benefits, current 7.3 5.3  
Losses arising during the period 11.9 (2.6)  
Amortization of net actuarial gain (58.4) (61.1)  
Net actuarial gain on pretax basis (415.3) (461.8)  
Defined Benefit Pension Plan | International      
Defined Benefit Plan Disclosure [Line Items]      
Pension settlement loss 1.2 0.6 $ 0.2
ABO for plans with obligation in excess plan assets 139.8 144.3  
PBO for plans with obligation in excess of plan assets $ 326.1 $ 295.1  
Expected return on plan assets 4.30% 4.20% 4.00%
Company contributions $ 27.4 $ 24.2  
Obligation at end of year 1,338.7 1,162.4 $ 1,137.5
Pension and postretirement benefits, current 0.9 0.6  
Losses arising during the period (56.5) 7.0  
Amortization of net actuarial gain (14.1) (12.2)  
Net actuarial gain on pretax basis $ (435.8) (506.4)  
Defined Benefit Pension Plan | U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Amortization period based on approximate average remaining life expectancy 22 years    
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure [Line Items]      
Obligation at end of year $ 12.0 14.0  
Pension and postretirement benefits, current 3.1 3.7  
Losses arising during the period 1.7 0.1  
Amortization of net actuarial gain 0.5 2.0  
Net actuarial gain on pretax basis $ 0.2 $ 2.4