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Goodwill and Other Intangible Assets - Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,121,482	$ 10,072,302
Accumulated Amortization	(5,805,018)	(5,498,612)
Net Carrying Amount	4,316,464	4,573,690
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	11,454,482	11,405,302
Net Carrying Amount	5,649,464	5,906,690
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	8,377,539	8,306,746
Accumulated Amortization	(5,192,041)	(4,932,590)
Net Carrying Amount	3,185,498	3,374,156
Dealer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,518,020	1,518,020
Accumulated Amortization	(419,390)	(379,475)
Net Carrying Amount	1,098,630	1,138,545
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	225,923	247,536
Accumulated Amortization	(193,587)	(186,547)
Net Carrying Amount	$ 32,336	$ 60,989

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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