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Retirement Plans - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Pensions  
Defined Benefit Plan Disclosure  
2018 $ 0.3
2019 0.5
2020 0.6
2021 0.8
2022 0.9
2023-2027 6.5
Other Benefits  
Defined Benefit Plan Disclosure  
2018 0.0
2019 0.0
2020 0.0
2021 0.0
2022 0.0
2023-2027 $ 0.2