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Retirement Plans (Tables)
 12 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost
The components of net periodic benefit cost for our Pension Plans are presented below.
 202020192018
 (in millions)
Service cost$1.5 $1.6 $1.8 
Components of net periodic cost (benefit) excluded from operating income:
Interest cost11.2 13.9 14.3 
Expected return on plan assets(16.9)(16.2)(16.5)
Amortization of actuarial net loss2.8 1.9 3.2 
Pension settlement— 0.7 — 
Other(0.1)0.1 — 
Pension costs (benefit) other than service(3.0)0.4 1.0 
Net periodic benefit cost (benefit)$(1.5)$2.0 $2.8 
Schedule of Accumulated and Projected Benefit Obligations P
Schedule Of Defined Benefit Plans Disclosures
Amounts recognized for Pension Plans are presented below.
 20202019
 (in millions)
Projected benefit obligations:
Beginning of year$356.6 $333.4 
Service cost1.5 1.6 
Interest cost11.2 13.9 
Actuarial gain13.7 38.2 
Benefits paid(23.5)(23.9)
Currency translation— (0.1)
Decrease in obligation due to curtailment / settlement— (6.5)
End of year$359.5 $356.6 
Accumulated benefit obligations at end of year$359.5 $356.6 
Plan assets:
Beginning of year$351.6 $343.5 
Actual return on plan assets32.2 38.6 
Employer contributions0.1 0.6 
Currency translation— (0.5)
Benefits paid(23.5)(23.9)
Settlements— (6.5)
Other— (0.2)
End of year$360.4 $351.6 
Accrued benefit cost at end of year:
Funded (unfunded) status$0.9 $(5.0)
Recognized on balance sheet:
Other noncurrent assets$0.9 $— 
Other noncurrent liabilities— (5.0)
$0.9 $(5.0)
Recognized in accumulated other comprehensive loss, before tax:
Net actuarial loss74.0 78.4 
$74.0 $78.4 
Schedule of Pension and Other Postretirement Benefits Activity in Accumulated Other Comprehensive Income (Loss) [Table Text Block] lan activity in accumulated other comprehensive loss, before tax, in 2020 is presented below, in millions.
Balance at beginning of year$78.4 
Actuarial gain(1.6)
Prior year actuarial loss amortization to net periodic cost(2.8)
Balance at end of year$74.0 
Schedule of Assumptions Used
A summary of key assumptions for the valuations of our Pension Plans is below.
 202020192018
Weighted average used to determine benefit obligations:
Discount rate
2.84 %3.26 %4.37 %
Weighted average used to determine net periodic cost:
Discount rate
3.26 %4.37 %3.88 %
Expected return on plan assets
5.00 %4.93 %4.68 %
Schedule of Strategic Allocation of Plan Assets [Table Text Block]
This trust’s strategic asset allocations, tactical range at September 30, 2020 and actual asset allocations are presented below.
Strategic asset allocationActual asset allocations at
 September 30,
 Tactical range202020192018
Fixed income investments80 %75 -80 %78 %79 %77 %
Equity investments20 15 -20 %21 19 21 
Cash— 0 -5 %1 2 2 
100 %100 %100 %100 %
Schedule of Allocation of Plan Assets
The assets of the Plan by level within the fair value hierarchy are presented below.
September 30, 2020
Level 1Level 2Total
 (in millions)
Fixed income$— $280.3 $280.3 
Equity:
Large cap index funds— 32.8 32.8 
   Mid cap index funds— 13.5 13.5 
  Small cap growth funds— 12.7 12.7 
International stocks:
Mutual funds7.4 — 7.4 
International funds— 10.4 10.4 
      Total equity7.4 69.4 76.8 
Cash and cash equivalents3.3 — 3.3 
$10.7 $349.7 $360.4 

September 30, 2019
Level 1Level 2Total
 (in millions)
Fixed income$— $277.8 $277.8 
Equity:
Large cap index funds— 29.8 29.8 
  Mid cap index funds— 9.8 9.8 
Small cap growth funds— 9.6 9.6 
International stocks:
Mutual funds6.9 — 6.9 
International funds— 10.3 10.3 
Total equity6.9 59.5 66.4 
Cash and cash equivalents7.4 — 7.4 
$14.3 $337.3 $351.6 
Schedule of Expected Benefit Payments
Our estimated future pension benefit payments are presented below in millions.
2021$24.7 
202224.5 
202324.1 
202423.7 
202523.2 
2026-2030108.2