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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)

X

- 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
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-Section 45
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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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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