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Employment and Compensation Arrangements - CPA Global Phantom Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Nov. 23, 2020	Oct. 01, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Goodwill	$ 6,036,515		$ 6,042,964	$ 2,861		$ 1,328,045
Operating Expenses	497,940	$ 268,900
Restructuring and impairment	67,895	$ 7,754
CPA Global
Share-based Payment Arrangement [Abstract]
Goodwill					$ 3,951,239
Shareholders' Equity
Other non-current liabilities					(24,307)
Revision of Prior Period, Error Correction, Adjustment
Share-based Payment Arrangement [Abstract]
Cost of Revenue and Selling, General and Administrative Expense	29,479
Restructuring and impairment	3,228
Shareholders' Equity
Cost of Revenue and Selling, General and Administrative Expense	$ 29,479
Revision Of Prior Period Error Correction Adjustment Amd No 2 | CPA Global
Shareholders' Equity
Other non-current liabilities					$ (19,478)

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