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Summary of Significant Accounting Policies Summary of Significant Accounting Policies, Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130533-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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