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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, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Percentage of Revenue, Constrained due to uncertainty	500.00%
Percentage of Revenue, Remaining Performance Obligation	5.00%
Contract with Customer, Asset, before Allowance for Credit Loss	$ 447.0	$ 438.7
Contract with Customer, Asset, Allowance for Credit Loss	(2.3)	(2.8)
Contract with Customer, Asset, after Allowance for Credit Loss	444.7	435.9
Contract with Customer, Liability	151.4	128.9
Out of Scope of Topic 606 Revenue [Member]
Disaggregation of Revenue [Line Items]
Fees and Commissions, Mortgage Banking and Servicing	$ 293.6	$ 337.1	$ 305.3

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Amount of allowance for credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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-Name Regulation S-K (SK)
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-Section 1402
-Subsection Instruction 3

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