Goodwill, Customer Relationships and Other Intangible Assets - Goodwill, Customer Relationships, and Other Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill	$ 1,964,000		$ 1,964,000
Indefinite-lived intangible assets	9,000		9,000
Total other intangible assets, net	5,127,000		5,470,000
Customer Relationships
Goodwill [Line Items]
Finite-lived intangible assets, net	3,501,000		3,811,000
Accumulated amortization	4,201,000		4,248,000
Capitalized Software
Goodwill [Line Items]
Finite-lived intangible assets, net	1,538,000		1,564,000
Accumulated amortization	4,017,000		4,045,000
Trade Names, Patents and Other
Goodwill [Line Items]
Finite-lived intangible assets, net	79,000		86,000
Accumulated amortization	$ 79,000		$ 72,000
Fully Amortized and Retired Customer Relationships
Goodwill [Line Items]
Gross carrying value		$ 352,000
Fully Amortized and Retired Capitalized Software
Goodwill [Line Items]
Gross carrying value		$ 153,000