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Summary of Significant Accounting Policies Summary of Significant Accounting Policies, Revenue Recognition (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
Percentage of Revenue, Constrained due to uncertainty 5.00%    
Contract with Customer, Asset, before Allowance for Credit Loss $ 388.3 $ 402.3  
Contract with Customer, Asset, Allowance for Credit Loss (3.9) (1.8)  
Contract with Customer, Asset, after Allowance for Credit Loss 384.4 400.5  
Contract with Customer, Liability 154.7 166.2  
Out of Scope of Topic 606 Revenue [Member]      
Disaggregation of Revenue [Line Items]      
Fees and Commissions, Mortgage Banking and Servicing $ 325.9 $ 286.3 $ 293.6