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Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Finite-lived Intangible Assets [Roll Forward] |  |
Gross Carrying Value | $ 2,344,891 | $ 2,344,967
Accumulated Amortization | 1,835,698 | 1,793,440
Total finite-lived intangible assets | 509,193 | 551,527
Indefinite-lived Intangible Assets [Roll Forward] |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 1,480,000 | 1,480,000
Indefinite-Lived Trade Names | 442,400 | 442,400
Intangible Assets, Gross (Excluding Goodwill) | 3,824,891 | 3,824,967
Other Intangible Assets Accumulated Amortization | 1,835,698 | 1,793,440
Indefinite Lived Trade Names Impairment Charges | 1,037,600 | 1,037,600
Intangible Assets Impairement Charges | 1,037,600 | 1,037,600
Intangible Assets, Net (Including Goodwill) | $ 951,593 | $ 993,927
Client relationships [Member] |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Weighted Average Useful Life | 14 years | 14 years
Gross Carrying Value | $ 2,256,291 | $ 2,256,367
Accumulated Amortization | 1,762,270 | 1,722,227
Total finite-lived intangible assets | $ 494,021 | $ 534,140
Trade names [Member] |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Weighted Average Useful Life | 10 years | 10 years
Gross Carrying Value | $ 88,600 | $ 88,600
Accumulated Amortization | 73,428 | 71,213
Total finite-lived intangible assets | $ 15,172 | $ 17,387

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