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Retirement Plans (Tables)
 12 Months Ended
Sep. 30, 2025
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:
 Fiscal Year
 PensionPostretirement
 2025202420252024
Change in projected benefit obligation  
Benefit obligation at beginning of year$448.4 $404.9 $4.9 $3.9 
Service cost 2.5 1.9 — — 
Interest cost18.0 21.1 0.2 0.2 
Actuarial (loss) gain
(25.2)43.1 (0.1)1.0 
Benefits paid, net(26.6)(28.4)(0.2)(0.2)
Foreign currency exchange rate changes5.9 5.8 (0.1)— 
Projected benefit obligation at end of year423.0 448.4 4.7 4.9 
Change in plan assets
Estimated fair value of plan assets at beginning of year412.3 363.9 — — 
Actual return on plan assets17.6 62.8 — — 
Company contributions7.4 7.9 0.2 0.2 
Benefits paid(26.6)(28.4)(0.2)(0.2)
Foreign currency exchange rate changes7.1 6.1 — — 
Estimated fair value of plan assets at end of year417.8 412.3 — — 
Funded status at end of year$(5.2)$(36.1)$(4.7)$(4.9)
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
 2025202420252024
Amounts recognized in the Consolidated Balance Sheets  
Noncurrent assets$23.3 $4.8 $— $— 
Current liabilities(0.9)(0.9)(0.3)(0.3)
Noncurrent liabilities(27.6)(40.0)(4.4)(4.6)
Net amount recognized$(5.2)$(36.1)$(4.7)$(4.9)
Amounts recognized in Accumulated other comprehensive loss
Net loss (gain)$93.0 $117.5 $(5.7)$(6.1)
Prior service credit— — — — 
Net amount recognized, pre-tax$93.0 $117.5 $(5.7)$(6.1)
Schedule of Changes Recognized in Other Comprehensive Income
Pre-tax changes recognized in Other comprehensive income for fiscal 2025 were as follows:
 PensionPost-
retirement
Changes in plan assets and benefit obligations recognized in Other comprehensive income  
Net (gain) loss arising during the year$(21.1)$(0.1)
Effect of exchange rates(0.7)0.2 
Amounts recognized as a component of net periodic benefit cost
Amortization or settlement recognition of net (loss) gain(2.6)0.2 
Total recognized in Other comprehensive income$(24.4)$0.3 
Schedule of Expected Future Benefit Payments
The Company’s expected future benefit payments are as follows:
 PensionPost-
retirement
Fiscal 2026
$33.8 $0.2 
Fiscal 2027
33.7 0.2 
Fiscal 2028
33.6 0.2 
Fiscal 2029
32.3 0.3 
Fiscal 2030
31.9 0.3 
Fiscal 2031 to 2035146.0 1.4 
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,
 20252024
Projected benefit obligation$241.5 $324.3 
Accumulated benefit obligation241.5 324.3 
Estimated fair value of plan assets213.1 283.4 
Schedule of Net Periodic Pension and Postretirement Benefit (Credit) Cost
The following table presents pension and post-retirement expense:
Fiscal Year
 PensionPostretirement
 202520242023202520242023
Service cost$2.5 $1.9 $1.9 $— $— $— 
Interest cost18.0 21.1 20.6 0.2 0.2 0.2 
Expected return on plan assets(21.7)(19.5)(21.5)— — — 
Recognized net actuarial loss (gain)2.6 1.8 1.7 (0.2)(0.3)(0.3)
Settlement loss recognized— — 7.9 — — — 
Net periodic benefit cost (credit)1.4 5.3 10.6 — (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
 202520242023202520242023
Plan obligations:  
Discount rate4.9 %4.5 %5.5 %4.8 %4.7 %5.6 %
Compensation increase rate2.5 %2.5 %2.5 %4.0 %4.0 %4.0 %
Net periodic benefit cost:
Discount rate4.5 %5.5 %5.1 %4.7 %5.6 %5.1 %
Expected long-term rate of return on plan assets5.1 %4.8 %4.9 %N/AN/AN/A
Compensation increase rate2.5 %2.5 %2.5 %4.0 %4.0 %4.0 %
Cash balance interest credit rate4.8 %4.1 %4.2 %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, 2025
Pension assets at estimated fair valueLevel 1Level 2Total
Equity   
U.S. equity$28.5 $— $28.5 
International equity49.5 — 49.5 
Debt
Corporate90.1 — 90.1 
Cash and cash equivalents5.7 — 5.7 
Total, excluding investments valued at net asset value (“NAV”)$173.8 $— $173.8 
Investments valued at NAV244.0 
Total$173.8 $— $417.8 
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
Corporate83.4 — 83.4 
Cash and cash equivalents4.8 — 4.8 
Total, excluding investments valued at NAV$160.6 $— $160.6 
Investments valued at NAV251.7 
Total$160.6 $— $412.3 

The following table sets forth the estimated fair value of the Company’s pension assets valued at NAV:
As of September 30,
20252024
Pension assets valued at NAV estimated at fair value
Equity
U.S. equity$36.7 $53.0 
International equity20.4 22.5 
Debt
U.S. government67.7 64.9 
Corporate
119.2 111.3 
Total investments valued at NAV$244.0 $251.7