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Current Expected Credit Losses (CECL) - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Jan. 01, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Current expected credit losses reserve	$ 2.9	$ 2.9	$ 1.9
Increase (decrease) in expected credit losses reserve	(0.4)	0.9
Accrued Commissions and Other Receivables, Net [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Current expected credit losses reserve	1.1	1.1	0.8
Increase (decrease) in expected credit losses reserve	0.3	1.1
Loans, Forgivable Loans and Other Receivables from Employees and Partners, Net [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Current expected credit losses reserve	1.8	1.8	$ 1.1
Increase (decrease) in expected credit losses reserve	$ (0.7)	$ 0.6

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

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+ References

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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