Goodwill and Other Intangible Assets - Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 9,731,253	$ 9,618,659
Accumulated Amortization	(4,588,970)	(4,282,014)
Net Carrying Amount	5,142,283	5,336,645
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	11,064,253	10,951,659
Net Carrying Amount	6,475,283	6,669,645
Trade name
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	1,333,000	1,333,000
Customer-Related Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,002,458	7,889,864
Accumulated Amortization	(4,083,130)	(3,798,319)
Net Carrying Amount	3,919,328	4,091,545
Dealer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,518,020	1,518,020
Accumulated Amortization	(319,487)	(299,459)
Net Carrying Amount	1,198,533	1,218,561
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	210,775	210,775
Accumulated Amortization	(186,353)	(184,236)
Net Carrying Amount	$ 24,422	$ 26,539