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Employee Benefit Plans - Future Estimates (Details) - Foreign Plan [Member]
$ in Millions
Dec. 31, 2017
USD ($)
Expected Future Benefit Payments [Abstract]  
2018 $ 1.7
2019 1.6
2020 1.7
2021 1.7
2022 1.8
2023 - 2027 10.9
Estimated Future Employer Contributions [Abstract]  
Estimated 2018 employer contribution $ 1.8