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Acquisitions - Summary of Acquisitions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |
Cash paid, net of cash acquired | $ 366.6 | $ 373.8 | $ 460.4
Debt issued |  | 125.1 |
Total | 393.0 | 498.9 |
Goodwill | 454.6 | 434.9 | $ 256.3
Acquisitions 2019 |  |  |
Business Acquisition [Line Items] |  |  |
Trade receivables, net | 0.0 |  |
Inventories | 105.2 |  |
Franchise value | 0.0 |  |
Property and equipment | 124.0 |  |
Other assets | 193.1 |  |
Floor plan notes payable | 0.0 |  |
Other liabilities | (29.3) |  |
Assets acquired and liabilities assumed, excluding goodwill | 393.0 |  |
Goodwill | 0.0 |  |
Assets acquired and liabilities assumed, net | $ 393.0 |  |
Acquisitions 2018 |  |  |
Business Acquisition [Line Items] |  |  |
Trade receivables, net |  | 0.7 |
Inventories |  | 180.0 |
Franchise value |  | 29.8 |
Property and equipment |  | 179.7 |
Other assets |  | 48.6 |
Floor plan notes payable |  | (10.8) |
Other liabilities |  | (2.3) |
Assets acquired and liabilities assumed, excluding goodwill |  | 425.7 |
Goodwill |  | 73.2 |
Assets acquired and liabilities assumed, net |  | $ 498.9 |

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