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Retirement Plans (Tables)
 12 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Benefit Obligations, Plan Assets and Funded Status of the Plans
The following tables present the benefit obligation, plan assets, and funded status of the plans:
 As of September 30,
 PensionPostretirement
 2024202320242023
Change in projected benefit obligation  
Benefit obligation at beginning of year$404.9 $439.4 $3.9 $4.1 
Service cost 1.9 1.9 — — 
Interest cost21.1 20.6 0.2 0.2 
Actuarial (loss) gain
43.1 (12.9)1.0 (0.1)
Benefits paid, net(28.4)(29.6)(0.2)(0.3)
Plan settlements— (21.9)— — 
Expenses paid— — — — 
Foreign currency exchange rate changes5.8 7.4 — — 
Projected benefit obligation at end of year448.4 404.9 4.9 3.9 
Change in plan assets
Estimated fair value of plan assets at beginning of year363.9 398.2 — — 
Actual return on plan assets62.8 8.9 — — 
Company contributions7.9 0.9 0.2 0.3 
Plan settlements— (21.9)— — 
Benefits paid(28.4)(29.6)(0.2)(0.3)
Expenses paid— — — — 
Foreign currency exchange rate changes6.1 8.2 — — 
Divestiture— (0.8)— — 
Estimated fair value of plan assets at end of year412.3 363.9 — — 
Funded status at end of year$(36.1)$(41.0)$(4.9)$(3.9)
Schedule of Amounts Recognized in the Consolidated Balance Sheets
The following table presents the amounts recognized in the Consolidated Balance Sheets and Consolidated Statements of Changes in Shareholders’ Equity:
 As of September 30,
 PensionPostretirement
 2024202320242023
Amounts recognized in the Consolidated Balance Sheets  
Noncurrent assets$4.8 $13.5 $— $— 
Current liabilities(0.9)(1.0)(0.3)(0.2)
Noncurrent liabilities(40.0)(53.5)(4.6)(3.7)
Net amount recognized$(36.1)$(41.0)$(4.9)$(3.9)
Amounts recognized in Accumulated other comprehensive loss
Net loss (gain)$117.5 $119.3 $(6.1)$(7.3)
Prior service credit— — — — 
Net amount recognized, pre-tax$117.5 $119.3 $(6.1)$(7.3)
Schedule of Changes Recognized in Other Comprehensive Income
Pre-tax changes recognized in Other comprehensive income for fiscal 2024 were as follows:
 PensionPost-
retirement
Changes in plan assets and benefit obligations recognized in Other comprehensive income  
Net (gain) loss arising during the year$(0.1)$0.9 
Effect of exchange rates— — 
Amounts recognized as a component of net periodic benefit cost
Amortization or settlement recognition of net (loss) gain(1.8)0.3 
Total recognized in Other comprehensive income$(1.9)$1.2 
Schedule of Expected Future Benefit Payments
The Company’s expected future benefit payments are as follows:
 PensionPost-
retirement
Fiscal 2025
$34.6 $0.2 
Fiscal 2026
33.9 0.2 
Fiscal 2027
33.7 0.2 
Fiscal 2028
33.5 0.3 
Fiscal 2029
31.8 0.3 
Fiscal 2029 to 2032147.2 1.5 
Schedule of Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets The following table shows pension plans with an accumulated benefit obligation in excess of plan assets:
 As of September 30,
 20242023
Projected benefit obligation$324.3 $309.1 
Accumulated benefit obligation324.3 309.1 
Estimated fair value of plan assets283.4 254.6 
Schedule of Net Periodic Pension and Postretirement Benefit (Credit) Cost
The following table presents pension and post-retirement expense:
Fiscal Year
 PensionPostretirement
 202420232022202420232022
Service cost$1.9 $1.9 $3.8 $— $— $— 
Interest cost21.1 20.6 10.2 0.2 0.2 0.2 
Expected return on plan assets(19.5)(21.5)(21.1)— — — 
Recognized net actuarial loss (gain)1.8 1.7 6.4 (0.3)(0.3)(0.3)
Settlement loss recognized— 7.9 1.8 — — — 
Net periodic benefit cost (credit)5.3 10.6 1.1 (0.1)(0.1)(0.1)
Schedule of Actuarial Assumptions
The following table presents assumptions, which reflect weighted-averages for the component plans, used in determining the above information:
 Fiscal Year
 PensionPostretirement
 202420232022202420232022
Plan obligations:  
Discount rate4.5 %5.5 %5.1 %4.7 %5.6 %5.1 %
Compensation increase rate2.5 %2.5 %2.5 %4.0 %4.0 %4.0 %
Net periodic benefit cost:
Discount rate5.5 %5.1 %2.3 %5.6 %5.1 %3.5 %
Expected long-term rate of return on plan assets4.8 %4.9 %4.2 %N/AN/AN/A
Compensation increase rate2.5 %2.5 %2.5 %4.0 %4.0 %4.0 %
Cash balance interest credit rate4.1 %4.2 %3.3 %N/AN/AN/A
Schedule of Fair Value of Plan Assets
The following table sets forth the estimated fair value of the Company’s pension assets segregated by level within the estimated fair value hierarchy. Refer to Note 18 of Notes to Consolidated Financial Statements for further discussion on the estimated fair value hierarchy and estimated fair value principles.
September 30, 2024
Pension assets at estimated fair valueLevel 1Level 2Total
Equity   
U.S. equity$26.9 $— $26.9 
International equity45.5 — 45.5 
Debt
U.S. government— — — 
Other government— — — 
Corporate83.4 — 83.4 
Cash and cash equivalents4.8 — 4.8 
Other— — — 
Total, excluding investments valued at net asset value (“NAV”)$160.6 $— $160.6 
Investments valued at NAV251.7 
Total$160.6 $— $412.3 
September 30, 2023
Pension assets at estimated fair valueLevel 1Level 2Total
Equity   
U.S. equity$22.7 $— $22.7 
International equity54.4 — 54.4 
Debt
U.S. government— — — 
Other government— — — 
Corporate54.9 — 54.9 
Cash and cash equivalents3.0 — 3.0 
Other— — — 
Total, excluding investments valued at NAV$135.0 $— $135.0 
Investments valued at NAV228.9 
Total$135.0 $— $363.9 
The following table sets forth the estimated fair value of the Company’s pension assets valued at NAV:
As of September 30,
20242023
Pension assets valued at NAV estimated at fair value
Equity
U.S. equity$53.0 $48.9 
International equity22.5 21.4 
Debt
U.S. government64.9158.6 
Corporate
111.3 — 
Total investments valued at NAV$251.7 $228.9