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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, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 9,790,305 | $ 9,618,659
Accumulated Amortization | (4,888,777) | (4,282,014)
Net Carrying Amount | 4,901,528 | 5,336,645
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 11,123,305 | 10,951,659
Net Carrying Amount | 6,234,528 | 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 | 8,067,110 | 7,889,864
Accumulated Amortization | (4,366,510) | (3,798,319)
Net Carrying Amount | 3,700,600 | 4,091,545
Dealer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,518,020 | 1,518,020
Accumulated Amortization | (339,499) | (299,459)
Net Carrying Amount | 1,178,521 | 1,218,561
Other Intangible Assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 205,175 | 210,775
Accumulated Amortization | (182,768) | (184,236)
Net Carrying Amount | $ 22,407 | $ 26,539

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