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Employee Retirement Plans - Expected Payments for Pension Benefits and Other Postretirement Welfare Benefits (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure  
Fiscal 2020 $ 32.7
Fiscal 2021 31.7
Fiscal 2022 33.0
Fiscal 2023 35.6
Fiscal 2024 37.2
Fiscal 2025 - 2029 204.3
Other Postretirement Benefits  
Defined Benefit Plan Disclosure  
Fiscal 2020 1.0
Fiscal 2021 1.0
Fiscal 2022 1.0
Fiscal 2023 0.9
Fiscal 2024 0.9
Fiscal 2025 - 2029 $ 4.9