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Goodwill and Intangible Assets (Changes in Carrying Amounts of Goodwill) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 1,546,065
Goodwill acquired	87,347
Goodwill removed due to sale of businesses	(3,983)
Foreign exchange translation	(3,159)
Ending balance	1,626,270
Operating Segments | Digital Media
Goodwill [Roll Forward]
Beginning balance	1,016,880
Goodwill acquired	87,347
Goodwill removed due to sale of businesses	(3,983)
Foreign exchange translation	(1,021)
Ending balance	1,099,223
Operating Segments | Cybersecurity and Martech
Goodwill [Roll Forward]
Beginning balance	529,185
Goodwill acquired	0
Goodwill removed due to sale of businesses	0
Foreign exchange translation	(2,138)
Ending balance	$ 527,047

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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