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v3.21.2

Subsequent Events (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 03, 2021 | Jul. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends declared per share of common stock (in dollars per share) |  |  | $ 0.01 | $ 0.01 | $ 0.02 | $ 0.15
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Stock or units repurchase program, authorized amount | $ 400.0 |  |  |  |  |
Subsequent Event | Cantor Futures Exchange Business |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Payments to acquire businesses |  | $ 4.9 |  |  |  |
Class A Common Stock | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends declared per share of common stock (in dollars per share) | $ 0.01 |  |  |  |  |
Class B Common Stock | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Dividends declared per share of common stock (in dollars per share) | $ 0.01 |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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