Commitments and Contingencies - Regulatory Issues (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
AFSC
Acquisitions
Percentage of total revenues attributable to subsidiary	2.40%	3.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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