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Retirement Plans (Tables)
 12 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
The components of net periodic cost for the Pension Plan are presented below:

 202520242023
 (in millions)
Service cost$0.7 $0.6 $0.8 
Components of net periodic cost excluded from operating income:
Interest cost12.0 13.9 13.9 
Expected return on plan assets(14.4)(13.0)(13.9)
Amortization of actuarial net loss2.2 3.1 3.7 
Pension (benefit) expense other than service(0.2)4.0 3.7 
Net periodic cost$0.5 $4.6 $4.5 
Schedule Of Defined Benefit Plans Disclosures
Amounts recognized for the Pension Plan are presented below:
September 30,
 20252024
 (in millions)
Projected benefit obligations:
Beginning of year$247.9 $233.2 
Service cost0.7 0.6 
Interest cost12.0 13.9 
Actuarial (gain)/loss(7.7)22.2 
Benefits paid(21.5)(22.0)
Accumulated benefit obligations at end of year$231.4 $247.9 
Plan assets:
Beginning of year$261.4 $239.8 
Actual return on plan assets11.0 43.6 
Benefits paid(21.5)(22.0)
Fair value of plan assets at end of year$250.9 $261.4 
Prepaid benefit cost at end of year:
Funded status$19.5 $13.5 
Recognized on balance sheet:
Other noncurrent assets$19.5 $13.5 
Recognized in accumulated other comprehensive loss, before tax:
Net actuarial loss$50.2 $56.6 
Schedule of Pension and Other Postretirement Benefits Activity in Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Pension Plan activity in accumulated other comprehensive loss, before tax, in 2025 is presented below (in millions):

Balance at beginning of year$56.6 
Actuarial gain(4.2)
Prior year actuarial loss amortization to net periodic cost(2.2)
Balance at end of year$50.2 
Schedule of Assumptions Used
A summary of key assumptions for the valuations of the Pension Plan is as follows:
September 30,
 202520242023
Weighted average used to determine benefit obligations:
Discount rate
5.47 %5.07 %6.29 %
Weighted average used to determine net periodic cost:
Discount rate
5.07 %6.29 %5.79 %
Expected return on plan assets
5.75 %5.75 %5.75 %
Schedule of Strategic Allocation of Plan Assets [Table Text Block]
Strategic asset allocations, tactical range as of September 30, 2025 and actual asset allocations are as follows:

Strategic asset allocationActual asset allocations at
 September 30,
 Tactical range202520242023
Fixed income investments70 %67 %-73 %69 %69 %70 %
Equity investments30 27 %-33 %30 30 29 
Cash— 0 %-5 %1 1 1 
100 %100 %100 %100 %
Schedule of Allocation of Plan Assets
The assets of the Pension Plan by level within the fair value hierarchy are as follows:

September 30, 2025
Level 1Level 2Total
 (in millions)
Fixed income$131.2 $41.9 $173.1 
Equity:
Large cap index funds38.0 — 38.0 
International stocks:
International funds37.7 — 37.7 
      Total equity75.7 — 75.7 
Cash and cash equivalents2.1 — 2.1 
Total Plan assets
$209.0 $41.9 $250.9 

September 30, 2024
Level 1Level 2Total
 (in millions)
Fixed income$131.8 $49.8 $181.6 
Equity:
Large cap index funds39.1 — 39.1 
International stocks:
International funds38.9 — 38.9 
       Total equity78.0 — 78.0 
Cash and cash equivalents1.8 — 1.8 
Total Plan assets
$211.6 $49.8 $261.4 
Schedule of Expected Benefit Payments
Our estimated future pension benefit payments as of September 30, 2025 are presented below (in millions):

2026$22.3 
202722.0 
202821.5 
202920.9 
203020.3 
2031-203590.7 
Total
$197.7