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Pension Benefit Obligations - Future payments (Details)
$ in Millions
Sep. 30, 2018
USD ($)
United States  
Expected future benefit payments  
2019 $ 42.9
2020 42.6
2021 41.7
2022 41.7
2023 41.3
2024-2028 204.4
Total 414.6
Foreign Pension Plan, Defined Benefit  
Expected future benefit payments  
2019 59.0
2020 54.9
2021 56.6
2022 58.4
2023 60.5
2024-2028 327.9
Total $ 617.3