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Organization and Basis of Presentation - Accounting Standards Adopted (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2020
Jan. 01, 2019
Accounting Standards Adopted in 2019          
Corporate tax rate (as a percent) 21.00% 21.00% 35.00%    
Lease liability $ 44.4        
Right-of-use asset $ 44.3        
Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false] false        
ASU 2018-15          
Accounting Standards Adopted in 2019          
Capitalized hosting arrangements that are service contracts $ 10.6        
Restatement adjustment | ASU 2016-02          
Accounting Standards Adopted in 2019          
Lease liability         $ 50.3
Right-of-use asset         $ 50.6
Forecast adjustment | Minimum | ASU 2016-13          
Accounting Standards Adopted in 2019          
Percentage of estimated increase in ACL and the reserve for unfunded commitments       10.00%  
Forecast adjustment | Maximum | ASU 2016-13          
Accounting Standards Adopted in 2019          
Percentage of estimated increase in ACL and the reserve for unfunded commitments       15.00%