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Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Changes in plan assets and benefit obligation recognized in other comprehensive income or loss [Abstract]      
Net (gain) loss $ 7.8 $ (3.4) $ 24.0
Pension Benefits | UNITED STATES      
Weighted-average assumptions used to determine net benefit cost [Abstract]      
Discount rate 6.06% 5.65% 3.05%
Rate of compensation increase 3.00% 3.00% 3.00%
Expected return on plan assets 7.00% 6.50% 5.75%
Pension Benefits | SERP      
Weighted-average assumptions used to determine net benefit cost [Abstract]      
Discount rate 5.99%    
Pension Benefits | Other international      
Components of net periodic benefit cost [Abstract]      
Service cost $ 0.3 $ 0.0 $ 0.0
Interest cost 25.6 23.3 15.7
Expected return on plan assets (34.7) (30.8) (24.8)
Recognized net actuarial (gain) loss 0.1 (0.1) 0.0
Recognized prior service cost 0.5 0.4 0.4
Net periodic benefit cost (income) $ (8.2) $ (7.0) $ (8.7)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Weighted-average assumptions used to determine net benefit cost [Abstract]      
Discount rate 5.67% 5.15% 2.05%
Rate of compensation increase 3.02% 3.85% 3.45%
Expected return on plan assets 6.26% 5.63% 2.73%
Changes in plan assets and benefit obligation recognized in other comprehensive income or loss [Abstract]      
Net (gain) loss $ 2.6 $ 7.6 $ 46.2
Recognized gain (loss) (0.1) (0.1) 0.0
Plan inception 0.1 0.0 0.0
Recognized prior service cost (0.5) (0.4) (0.4)
Total recognized in other comprehensive income or loss (before tax effects) 2.1 7.1 45.8
Pension Benefits | North America      
Components of net periodic benefit cost [Abstract]      
Service cost 2.5 2.2 4.3
Interest cost 5.8 5.3 3.5
Expected return on plan assets (8.1) (7.5) (7.0)
Recognized net actuarial (gain) loss (0.5) (0.2) 1.6
Recognized prior service cost 0.7 0.1 0.1
Net periodic benefit cost (income) $ 0.4 $ (0.1) $ 2.5
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Changes in plan assets and benefit obligation recognized in other comprehensive income or loss [Abstract]      
Net (gain) loss $ (5.7) $ (8.0) $ (4.7)
Recognized gain (loss) 0.5 0.2 (1.6)
Plan inception 8.3 0.0 0.0
Recognized prior service cost (0.7) (0.1) (0.1)
Total recognized in other comprehensive income or loss (before tax effects) $ 2.4 $ (7.9) $ (6.4)
Pension Benefits | CANADA      
Weighted-average assumptions used to determine net benefit cost [Abstract]      
Discount rate 5.68% 5.12% 3.32%
Rate of compensation increase 2.75% 2.75% 2.75%
Expected return on plan assets 6.00% 5.75% 5.25%
Other Benefits | UNITED STATES      
Weighted-average assumptions used to determine net benefit cost [Abstract]      
Discount rate 6.01% 5.62% 2.89%
Other Benefits | North America      
Components of net periodic benefit cost [Abstract]      
Service cost $ 0.2 $ 0.3 $ 0.5
Interest cost 2.7 2.5 1.5
Recognized net actuarial (gain) loss (1.0) (0.5) 0.6
Recognized prior service cost (0.6) (4.7) (4.6)
Net periodic benefit cost (income) $ 1.3 $ (2.4) $ (2.0)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Other Nonoperating Income (Expense)
Changes in plan assets and benefit obligation recognized in other comprehensive income or loss [Abstract]      
Net (gain) loss $ 2.5 $ (3.0) $ (17.5)
Recognized gain (loss) 1.0 0.5 (0.6)
Recognized prior service cost 0.6 4.7 4.6
Total recognized in other comprehensive income or loss (before tax effects) $ 4.1 $ 2.2 $ (13.5)
Other Benefits | CANADA      
Weighted-average assumptions used to determine net benefit cost [Abstract]      
Discount rate 5.67% 5.12% 3.45%
Rate of compensation increase 2.75% 2.75% 2.75%