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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Gain/(loss) on instrument specific credit risk $ 0.4 $ 0.2 $ 0.5
Disposition of Acquired Properties | Corporate      
Segment Reporting Information [Line Items]      
Long-lived asset impairment 4.6 3.9 3.0
Reversed asset impairment charges 0.7 $ 1.5  
Disposition of Acquired Properties | Regional Banking      
Segment Reporting Information [Line Items]      
Long-lived asset impairment     $ 0.8
2019 Business Optimization | Disposition of Acquired Properties | Corporate      
Segment Reporting Information [Line Items]      
Long-lived asset impairment 1.5    
2019 Business Optimization | Leased Assets | Corporate      
Segment Reporting Information [Line Items]      
Long-lived asset impairment 14.0    
Reversed asset impairment charges 1.4    
Rebranding Initiative | Leased Assets | Corporate      
Segment Reporting Information [Line Items]      
Long-lived asset impairment $ 7.1