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Derivative Financial Instruments - Zero-Cost Interest Rate Collar (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | $ 1,467.7 | $ 1,197.2
Ending balance | 2,661.5 | 1,467.7
Interest rate collar | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (1.0) | 0.0
Amounts reclassified from AOCI to floorplan interest expense | 1.8 | 0.0
Loss recorded from interest rate collar | (9.4) | (1.0)
Ending balance | (8.6) | (1.0)
Accrued Liabilities | Interest rate collar | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (0.1) | 0.0
Amounts reclassified from AOCI to floorplan interest expense | 1.8 | 0.0
Loss recorded from interest rate collar | (4.3) | (0.1)
Ending balance | (2.6) | (0.1)
Other Long-Term Liabilities | Interest rate collar | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |
Beginning balance | (0.9) | 0.0
Amounts reclassified from AOCI to floorplan interest expense | 0.0 | 0.0
Loss recorded from interest rate collar | (5.1) | (0.9)
Ending balance | $ (6.0) | $ (0.9)

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- Definition Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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- Definition Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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