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Financial Instruments and Fair Value Measurements - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) swap	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) swap	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment balances	$ 3,600,000		$ 3,600,000		$ 2,800,000
Gain (loss) related to hedge ineffectiveness	0		0
Gain (loss) related to hedge ineffectiveness		$ 0		$ 0
Increase (decrease) in floor plan interest expense due to impact of interest rate hedges	(100,000)	$ 1,100,000	(700,000)	$ 4,500,000
Maximum notional value of derivatives in effect at any time	896,900,000		896,900,000
Accumulated unrealized gains (losses), net of income taxes	10,800,000		10,800,000
Accumulated unrealized gains (losses), net of income taxes					$ 15,900,000
Amount expected to be reclassified from other comprehensive loss into earnings	$ 500,000		$ 500,000
Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of additional forward interest rate swaps | swap	25		25
Notional value	$ 896,900,000		$ 896,900,000
Weighted average interest rate	2.30%		2.30%
Forward Interest Rate Swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of additional forward interest rate swaps | swap	8		8
Notional value	$ 450,000,000.0		$ 450,000,000.0
Weighted average interest rate	1.70%		1.70%

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk.

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