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Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract assets related to contingent income $ 1.9 $ 2.5
Contract with customer, liability $ 0.5 2.0
Performance obligation, description of timing one year  
Insurance    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract with customer, asset, net $ 6.4 5.2
Wealth Management    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract with customer, asset, net $ 2.1 $ 2.2