Goodwill and Other Intangible Assets, net - Definite-Lived Intangible Assets by Major Asset Class (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	$ 920,140	$ 969,740
Definite-lived intangible assets, Accumulated Amortization	(540,736)	(524,594)
Definite-lived intangible assets, Net Carrying Amount	379,404	445,146
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	832,540	832,540
Definite-lived intangible assets, Accumulated Amortization	(487,782)	(416,452)
Definite-lived intangible assets, Net Carrying Amount	344,758	416,088
Acquired Software
Finite Lived Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	60,700	111,200
Definite-lived intangible assets, Accumulated Amortization	(40,362)	(98,411)
Definite-lived intangible assets, Net Carrying Amount	20,338	12,789
Other Trade Names
Finite Lived Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	24,800	23,900
Definite-lived intangible assets, Accumulated Amortization	(10,492)	(7,631)
Definite-lived intangible assets, Net Carrying Amount	14,308	16,269
Content Library
Finite Lived Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	2,100	2,100
Definite-lived intangible assets, Accumulated Amortization	(2,100)	(2,100)
Definite-lived intangible assets, Net Carrying Amount		$ 0