Shareholders' equity - Narrative (Details) - USD ($)				1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 13, 2023	Nov. 09, 2023	Jun. 02, 2023	Feb. 29, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020	Apr. 30, 2020	May 04, 2010
Stockholders Equity Note [Line Items]
Common stock, authorized (in shares)						800,000,000	800,000,000
Preferred stock, authorized (in shares)						2,000,000	2,000,000
Common stock, outstanding (in shares)						179,900,000	223,400,000
Treasury stock (in shares)						144,502,338	100,970,426
Preferred stock, issued (in shares)						0	0
Preferred stock, outstanding (in shares)						0	0
Equity method investments						$ 16,195,000	$ 17,003,000
CareerBuilder Investment
Stockholders Equity Note [Line Items]
Equity method investments						$ 0
December 2020 Share Repurchase Program
Stockholders Equity Note [Line Items]
Shares approved to be repurchased under share repurchase program, amount (up to)								$ 300,000,000
Shares repurchased under share repurchase program (in shares)						1,700,000
Shares acquired, average cost per share						$ 15.96
Treasury stock, value, acquired, cost method						$ 27,900,000
Accelerated Share Repurchase Program (ASR)
Stockholders Equity Note [Line Items]
Shares approved to be repurchased under share repurchase program, amount (up to)		$ 325,000,000	$ 300,000,000
Shares repurchased under share repurchase program (in shares)	17,300,000	17,300,000	15,200,000		3,100,000
Treasury stock, value, acquired, cost method	$ 260,000,000		$ 240,000,000
Stock repurchase program, percent repurchased	80.00%		80.00%
Accelerated Share Repurchase Program (ASR) | Subsequent Event
Stockholders Equity Note [Line Items]
Shares repurchased under share repurchase program (in shares)				4,000,000
December 2023 Share Repurchase Program
Stockholders Equity Note [Line Items]
Shares approved to be repurchased under share repurchase program, amount (up to)						$ 650,000,000
Stock options | Employee
Stockholders Equity Note [Line Items]
Shares reserved for issuance (in shares)									20,000,000	60,000,000
RSU Program | Employee
Stockholders Equity Note [Line Items]
Number of shares of common stock received for each RSU granted						1
Award vesting percentage						25.00%
RSUs
Stockholders Equity Note [Line Items]
Unrecognized compensation cost related to non-vested share-based compensation						$ 35,300,000
Unrecognized compensation cost related to non-vested share-based compensation for options, recognition period						2 years 1 month 6 days
PSAs
Stockholders Equity Note [Line Items]
Award vesting period						2 years
Additional service period						1 year
Incentive period						3 years
Unrecognized compensation cost related to non-vested share-based compensation						$ 5,300,000
Unrecognized compensation cost related to non-vested share-based compensation for options, recognition period						1 year 10 months 24 days