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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Percentage of Revenue, Constrained due to uncertainty | 5.00% |  |
Percentage of Revenue, Remaining Performance Obligation | 5.00% |  |
Contract with Customer, Asset, before Allowance for Credit Loss | $ 402.3 | $ 447.0 |
Contract with Customer, Asset, Allowance for Credit Loss | (1.8) | (2.3) |
Contract with Customer, Asset, after Allowance for Credit Loss | 400.5 | 444.7 |
Contract with Customer, Liability | 166.2 | 151.4 |
Out of Scope of Topic 606 Revenue [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Fees and Commissions, Mortgage Banking and Servicing | $ 286.3 | $ 293.6 | $ 337.1

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