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Employee Retirement Plans - Expected Payments for Pension Benefits and Other Postretirement Welfare Benefits (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure  
Fiscal 2019 $ 30.6
Fiscal 2020 31.1
Fiscal 2021 33.2
Fiscal 2022 39.0
Fiscal 2023 40.4
Fiscal 2024 - 2028 201.4
Other Postretirement Benefits  
Defined Benefit Plan Disclosure  
Fiscal 2019 1.0
Fiscal 2020 0.9
Fiscal 2021 0.9
Fiscal 2022 0.9
Fiscal 2023 0.9
Fiscal 2024 - 2028 $ 4.7