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Goodwill and Core Deposit Intangibles - Schedule of Future Amortization Expense (Details) - Core Deposits - USD ($)
$ in Millions
Dec. 31, 2019
Apr. 08, 2019
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]        
2020 $ 9.9      
2021 9.0      
2022 8.2      
2023 7.3      
Thereafter 16.8      
Total $ 59.3 $ 3.0 $ 59.1 $ 62.1