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Retirement Plans (Tables)
 12 Months Ended
Sep. 30, 2022
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
 2022202120222021
Change in projected benefit obligation  
Benefit obligation at beginning of year$618.7 $652.1 $5.5 $6.0 
Service cost 3.8 4.4 — — 
Interest cost10.2 9.6 0.2 0.2 
Actuarial gain(141.1)(14.9)(0.9)(0.8)
Benefits paid, net(26.4)(32.0)(0.3)(0.2)
Plan settlements(4.3)— — — 
Expenses paid— — — — 
Foreign currency exchange rate changes(21.5)(0.5)(0.4)0.3 
Projected benefit obligation at end of year439.4 618.7 4.1 5.5 
Change in plan assets
Estimated fair value of plan assets at beginning of year570.5 538.6 — — 
Actual return on plan assets(121.0)59.7 — — 
Company contributions0.9 4.9 0.3 0.2 
Plan settlements(4.3)— — — 
Benefits paid(26.4)(32.0)(0.3)(0.2)
Expenses paid— — — — 
Foreign currency exchange rate changes(21.5)(0.7)— — 
Estimated fair value of plan assets at end of year398.2 570.5 — — 
Funded status at end of year$(41.2)$(48.2)$(4.1)$(5.5)
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
 2022202120222021
Amounts recognized in the Consolidated Balance Sheets  
Noncurrent assets$12.0 $0.8 $— $— 
Current liabilities(0.9)(0.9)(0.2)(0.2)
Noncurrent liabilities(52.3)(48.1)(3.9)(5.3)
Net amount recognized$(41.2)$(48.2)$(4.1)$(5.5)
Amounts recognized in Accumulated other comprehensive loss
Net loss (gain)$128.6 $138.6 $(7.4)$(7.4)
Prior service credit— — — — 
Net amount recognized, pre-tax$128.6 $138.6 $(7.4)$(7.4)
Schedule of Changes Recognized in Other Comprehensive Income
Pre-tax changes recognized in Other comprehensive income for fiscal 2022 were as follows:
 PensionPost-
retirement
Changes in plan assets and benefit obligations recognized in Other comprehensive income  
Net loss (gain) arising during the year$1.0 $(0.9)
Effect of exchange rates(2.8)0.6 
Amounts recognized as a component of net periodic benefit cost
Amortization or curtailment recognition of prior service cost— — 
Amortization or settlement recognition of net (loss) gain(8.2)0.3 
Total recognized in Other comprehensive income$(10.0)$— 
Schedule of Expected Future Benefit Payments
The Company’s expected future benefit payments are as follows:
 PensionPost-
retirement
Fiscal 2023$36.0 $0.2 
Fiscal 202436.5 0.2 
Fiscal 202534.4 0.2 
Fiscal 202634.6 0.2 
Fiscal 202733.5 0.2 
Fiscal 2028 to 2032153.4 1.2 
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,
 20222021
Projected benefit obligation$331.0 $590.1 
Accumulated benefit obligation331.0 575.1 
Estimated fair value of plan assets277.8 541.9 
Schedule of Net Periodic Pension and Postretirement Benefit (Credit) Cost
The following table presents pension and post-retirement expense:
Fiscal Year
 PensionPostretirement
 202220212020202220212020
Service cost$3.8 $4.4 $4.3 $— $— $— 
Interest cost10.2 9.6 13.5 0.2 0.2 0.3 
Expected return on plan assets
(21.1)(22.4)(23.1)— — — 
Recognized net actuarial loss (gain)
6.4 9.5 9.3 (0.3)(0.3)(0.1)
Settlement loss recognized1.8 — 0.8 — — — 
Net periodic benefit cost (credit)1.1 1.1 4.8 (0.1)(0.1)0.2 
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
 202220212020202220212020
Plan obligations:  
Discount rate5.1 %2.3 %2.1 %5.1 %3.5 %2.8 %
Compensation increase rate2.5 %2.5 %2.5 %4.0 %N/AN/A
Net periodic benefit cost:
Discount rate2.3 %2.1 %2.5 %3.5 %2.8 %3.0 %
Expected long-term rate of return on plan assets4.2 %4.5 %4.8 %N/AN/AN/A
Compensation increase rate2.5 %2.5 %2.5 %4.0 %N/AN/A
Cash balance interest credit rate3.3 %1.9 %1.3 %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 16 of Notes to Consolidated Financial Statements for further discussion on the estimated fair value hierarchy and estimated fair value principles.
As of September 30, 2022
Pension assets at estimated fair valueLevel 1Level 2Total
Equity   
U.S. equity$49.1 $— $49.1 
International equity50.1 — 50.1 
Debt
U.S. government— 173.3 173.3 
Other government— — — 
Corporate47.4 — 47.4 
Cash and cash equivalents19.9 — 19.9 
Other13.8 — 13.8 
Total, excluding investments valued at net asset value (“NAV”)$180.3 $173.3 $353.6 
Investments valued at NAV44.6 
Total$180.3 $173.3 $398.2 
As of September 30, 2021
Pension assets at estimated fair valueLevel 1Level 2Total
Equity   
U.S. equity$84.5 $— $84.5 
International equity76.0 — 76.0 
Debt
U.S. government— 236.5 236.5 
Other government— — — 
Corporate66.0 — 66.0 
Cash and cash equivalents14.4 — 14.4 
Other18.4 0.1 18.5 
Total, excluding investments valued at NAV$259.3 $236.6 $495.9 
Investments valued at NAV74.6 
Total$259.3 $236.6 $570.5 

The following table sets forth the estimated fair value of the Company’s pension assets valued at NAV:
As of September 30,
20222021
Pension assets valued at NAV estimated at fair value
Equity
U.S. equity$11.4 $18.0 
International equity33.2 56.6 
Total investments valued at NAV$44.6 $74.6