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Employee Retirement Plans - Expected Payments for Pension Benefits and Other Postretirement Welfare Benefits (Details)
$ in Millions
Sep. 30, 2017
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure  
Fiscal 2018 $ 29.5
Fiscal 2019 29.9
Fiscal 2020 31.5
Fiscal 2021 39.0
Fiscal 2022 39.6
Fiscal 2023 - 2027 196.2
Other Postretirement Benefits  
Defined Benefit Plan Disclosure  
Fiscal 2018 1.1
Fiscal 2019 1.1
Fiscal 2020 1.1
Fiscal 2021 1.1
Fiscal 2022 1.0
Fiscal 2023 - 2027 $ 4.9