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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Increase (Decrease) in AOCI [Roll Forward]
BALANCE	$ 1,164.2	$ 1,172.7	$ 1,095.7	$ 1,124.3
Other comprehensive income (loss) before reclassifications
Pre-tax			(37.2)	(3.8)
Tax effect			6.0	(4.4)
Amounts reclassified from accumulated other comprehensive income (loss)
Provision (benefit) for income taxes			0.2	(0.9)
Net current period other comprehensive income (loss)	(17.0)	(2.3)	(31.7)	(5.5)
Tax effects reclassified from accumulated other comprehensive income (loss)				(0.1)
BALANCE	1,186.3	1,148.4	1,186.3	1,148.4
Floorplan interest expense (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax			(0.4)	4.0
Other interest expense, net (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax			(0.4)	0.5
Realized (gain) loss on interest rate swap termination (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax			0.1	(0.9)
Accumulated other comprehensive income (loss)
Increase (Decrease) in AOCI [Roll Forward]
BALANCE	(152.5)	(126.4)	(137.8)	(123.2)
Amounts reclassified from accumulated other comprehensive income (loss)
Net current period other comprehensive income (loss)	(17.0)	(2.3)	(31.7)	(5.5)
BALANCE	(169.5)	(128.8)	(169.5)	(128.8)
Accumulated income (loss) on foreign currency translation
Increase (Decrease) in AOCI [Roll Forward]
BALANCE			(146.7)	(122.5)
Other comprehensive income (loss) before reclassifications
Pre-tax			(12.0)	(22.2)
Tax effect			0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)
Provision (benefit) for income taxes			0.0	0.0
Net current period other comprehensive income (loss)			(12.0)	(22.2)
Tax effects reclassified from accumulated other comprehensive income (loss)				0.0
BALANCE	(158.7)	(144.7)	(158.7)	(144.7)
Accumulated income (loss) on foreign currency translation | Floorplan interest expense (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax			0.0	0.0
Accumulated income (loss) on foreign currency translation | Other interest expense, net (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax			0.0	0.0
Accumulated income (loss) on foreign currency translation | Realized (gain) loss on interest rate swap termination (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax			0.0	0.0
Accumulated income (loss) on interest rate swaps
Increase (Decrease) in AOCI [Roll Forward]
BALANCE			8.9
Other comprehensive income (loss) before reclassifications
Pre-tax			(25.2)
Tax effect			6.0
Amounts reclassified from accumulated other comprehensive income (loss)
Provision (benefit) for income taxes			0.2
Net current period other comprehensive income (loss)			(19.7)
BALANCE	$ (10.8)		(10.8)
Accumulated income (loss) on interest rate swaps | Floorplan interest expense (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax			(0.4)
Accumulated income (loss) on interest rate swaps | Other interest expense, net (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax			(0.4)
Accumulated income (loss) on interest rate swaps | Realized (gain) loss on interest rate swap termination (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax			$ 0.1
Accumulated income (loss) on interest rate swaps
Increase (Decrease) in AOCI [Roll Forward]
BALANCE				(0.7)
Other comprehensive income (loss) before reclassifications
Pre-tax				18.4
Tax effect				(4.4)
Amounts reclassified from accumulated other comprehensive income (loss)
Provision (benefit) for income taxes				(0.9)
Net current period other comprehensive income (loss)				16.7
Tax effects reclassified from accumulated other comprehensive income (loss)				(0.1)
BALANCE		$ 15.9		15.9
Accumulated income (loss) on interest rate swaps | Floorplan interest expense (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax				4.0
Accumulated income (loss) on interest rate swaps | Other interest expense, net (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax				0.5
Accumulated income (loss) on interest rate swaps | Realized (gain) loss on interest rate swap termination (pre-tax)
Amounts reclassified from accumulated other comprehensive income (loss)
Pre-tax				$ (0.9)

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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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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