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Subsequent Events (Details) - USD ($)				1 Months Ended						3 Months Ended	5 Months Ended	9 Months Ended
Subsequent Events (Details) - USD ($)	Oct. 25, 2021	Oct. 01, 2020	Feb. 28, 2020	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jan. 31, 2021	Jun. 30, 2020	Feb. 29, 2020	Mar. 31, 2020	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Oct. 14, 2021	Aug. 31, 2021	Jun. 14, 2021	Dec. 31, 2020	Jan. 01, 2020	May 13, 2019
Subsequent Events
Impairment of Long-Lived Assets to be Disposed of										$ 18,431,000
Number of shares issued (in shares)				25,000,000	44,230,768			50,400,000	27,600,000
Sale of stock, price per share (usd per share)				$ 25.25				$ 22.50	$ 20.25			$ 25.25				$ 26.00
Net proceeds after fees					$ 728,080,000			$ 304,030,000
Debt face amount		$ 1,600,000
Number of shares called per warrant (in shares)																	52,800,000		52,800,000
Warrant exercise price (usd per share)																			$ 11.50
Proceeds from warrant exercises												$ 0	$ 277,526,000
Stock Repurchase Program, Authorized Amount															$ 250,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount				$ 184,785,000								$ 184,785,000
Brand Protection, AntiPiracy, and AntiFraud Solutions \| Discontinued Operations, Disposed of by Sale
Subsequent Events
Purchase price																		$ 3,751,000
Impairment of intangible assets													17,967,000
Goodwill, impairment loss													$ 468,000
Subsequent Event
Subsequent Events
Stock Repurchase Program, Authorized Amount														$ 250,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount														$ 185,000
Preferred Stock, Dividends Per Share, Declared	$ 1.3125
CPA Global
Subsequent Events
Stock issued		216,683,778					1,500,000
Value of stock issued							$ 43,890,000
Total consideration		$ 8,839,599,000
Cash		2,078,084,000
Clarivate stock to be issued		$ 6,761,515,000
Newly issued ordinary shares (in shares)		218,183,778										1,500,000
Decision Resources Group
Subsequent Events
Total consideration			$ 964,997,000
Cash			$ 900,000,000
Newly issued ordinary shares (in shares)			2,895,638			2,895,638						2,895,638
ProQuest \| Subsequent Event \| Forecast
Subsequent Events
Newly issued ordinary shares (in shares)											46,910,923