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Subsequent Events (Details) $ / shares in Units, $ in Millions							6 Months Ended
	Aug. 05, 2021 USD ($) $ / shares	Aug. 02, 2021 USD ($) shares	Jul. 02, 2021 shares	Jun. 25, 2021 shares	Nov. 30, 2020 shares	Dec. 02, 2019 shares	Jun. 30, 2021 shares
Subsequent Event
Shares settled (in shares)					741,505	898,685	944,329
Common Stock | Nasdaq Earn-Out
Subsequent Event
Shares settled (in shares)				6,222,340
Subsequent Event
Subsequent Event
Shares authorized for repurchase | $	$ 400.0
Subsequent Event | Affiliated Entity
Subsequent Event
Percentage above fair market value of collateral provided (percent)		130.00%
Minimum maintenance margin of collateral provided (percent)		120.00%
Subsequent Event | CF Secured | Affiliated Entity
Subsequent Event
Initial cash to repurchase shares rate		0.0095
Subsequent Event | Revolving Credit Facility | CF Secured | Affiliated Entity
Subsequent Event
Debt instrument yield (in percentage)		1.00%
Subsequent Event | Nasdaq Earn-Out | Affiliated Entity | CF Secured
Subsequent Event
Proceeds received to repurchase shares | $		$ 260.0
Shares delivered as collateral (shares)		1,818,000
Subsequent Event | Common Stock | Nasdaq Earn-Out
Subsequent Event
Shares settled (in shares)			944,329
Subsequent Event | Common Class A
Subsequent Event
Common stock dividends per share declared (in dollars per share) | $ / shares	$ 0.01
Subsequent Event | Common Class B
Subsequent Event
Common stock dividends per share declared (in dollars per share) | $ / shares	$ 0.01

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