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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
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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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