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Goodwill and Intangible Assets - Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Expected amortization expense for future periods    
2019 $ 0.8  
2020 0.7  
2021 0.7  
2022 0.7  
2023 0.7  
Thereafter 6.4  
Intangible assets, net $ 10.0 $ 10.8