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Intangible Assets - Amortization (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 0.7  
2022 0.7  
2023 0.7  
2024 0.7  
2025 0.8  
Thereafter 5.3  
Intangible assets, net $ 8.9 $ 9.3