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Shareholders' Equity (Details) $ / shares in Units, $ in Thousands						1 Months Ended			2 Months Ended	3 Months Ended	9 Months Ended
	Oct. 25, 2021 $ / shares	Jan. 21, 2021 shares	Oct. 01, 2020 shares	Feb. 28, 2020 shares	May 13, 2019 $ / shares shares	Jul. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2021 shares	Jan. 31, 2021 shares	Feb. 21, 2020 $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Oct. 14, 2021 USD ($)	Aug. 31, 2021 USD ($)	Jun. 14, 2021 $ / shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares
Shareholders' Equity
Vesting period					3 years
Subscribed number of shares											0
Capital stock, issued (in shares)										639,750,620	639,750,620				606,329,598
Capital stock, par value (in dollars per share) | $ / shares										$ 0	$ 0				$ 0
Number of shares called per warrant (in shares)					52,800,000										52,800,000
Warrant exercise price (usd per share) | $ / shares					$ 11.50
Class of Warrant or Right, Outstanding									24,132,666
Conversion ratio											1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right															1
Issuance of common stock, net (in shares)		131,564
Common Stock, Voting Rights											one
Preferred Stock, Liquidation Preference Per Share | $ / shares														$ 100.00
Dividends, Cash | $						$ 1
Stock Issued During Period, Value, Stock Dividend | $						$ 16,141				$ 16,141
Stock Repurchase Program, Authorized Amount | $													$ 250,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $										184,785	$ 184,785
Common Stock Dividends, Shares						664,730
Subsequent Event
Shareholders' Equity
Preferred Stock, Dividends Per Share, Declared | $ / shares	$ 1.3125
Stock Repurchase Program, Authorized Amount | $												$ 250,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $												$ 185
CPA Global
Shareholders' Equity
Newly issued ordinary shares (in shares)											1,500,000
Stock issued			210,357,918					1,500,000
Decision Resources Group
Shareholders' Equity
Newly issued ordinary shares (in shares)				2,895,638			2,895,638				2,895,638
Warrant [Member]
Shareholders' Equity
Warrant exercise price (usd per share) | $ / shares									$ 11.50
Conversion ratio									1
Management Incentive Plan
Shareholders' Equity
Vesting period											5 years
Preferred Shares
Shareholders' Equity
Preferred Stock, Dividends Per Share, Declared | $ / shares						$ 1.12
Dividends Payable | $										$ 6,289	$ 6,289
Churchill Public Shareholders
Shareholders' Equity
Issued and outstanding (in shares)															87,749,999
Churchill Public Shareholders | Public shares
Shareholders' Equity
Issued and outstanding (in shares)															68,999,999
Churchill Public Shareholders | Founder shares
Shareholders' Equity
Issued and outstanding (in shares)															18,750,000
Minimum
Shareholders' Equity
Preferred Stock, Convertible, Conversion Ratio														3.2052
Maximum
Shareholders' Equity
Preferred Stock, Convertible, Conversion Ratio														3.8462
Maximum | CPA Global
Shareholders' Equity
Issuance of common stock, net (in shares)			218,183,778
Newly issued ordinary shares (in shares)			218,306,663
Sponsor agreement
Shareholders' Equity
Capital stock, issued (in shares)																7,000,000
Capital stock, par value (in dollars per share) | $ / shares																$ 20.00
Sponsor agreement | Minimum
Shareholders' Equity
Consecutive Trading Day Period											40 days
Sponsor agreement | Maximum
Shareholders' Equity
Consecutive Trading Day Period											60 days

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