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Employee Benefit Plans - Estimated Future Benefit Payments for Companys Pension Plans and Reflect Expected Future Service (Details) - Defined Benefit Pension Plans
$ in Millions
Dec. 31, 2017
USD ($)
Defined Benefit Plan  
2018 $ 1.2
2019 1.3
2020 1.4
2021 1.4
2022 1.5
2023 to 2027 $ 8.7