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Business Combinations, Goodwill and Intangible Assets, Intangible Asset Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 $ 2.8  
2021 2.8  
2022 2.8  
2023 2.6  
2024 1.8  
Thereafter 16.8  
Net book value $ 29.6 $ 32.4