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Current Expected Credit Losses (CECL) - Changes in CECL Allowance Reserve (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | $ 2.4 | $ 2.6 | $ 1.9
Current-period provision for expected credit losses | 12.5 | (0.2) | 0.7
Ending balance | 14.9 | 2.4 | 2.6
Accrued commissions and other receivables, net |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | 0.7 | 1.0 | 0.8
Current-period provision for expected credit losses | 4.7 | (0.3) | 0.2
Ending balance | 5.4 | 0.7 | 1.0
Loans, forgivable loans and other receivables from employees and partners, net |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | 1.7 | 1.6 | 1.1
Current-period provision for expected credit losses | 0.8 | 0.1 | 0.5
Ending balance | 2.5 | 1.7 | 1.6
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Beginning balance | 0.0 | 0.0 | 0.0
Current-period provision for expected credit losses | 7.0 | 0.0 | 0.0
Ending balance | $ 7.0 | $ 0.0 | $ 0.0

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: 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 5: 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 Reference 6: 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 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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