Income Taxes Deferred Income Tax Asset and Liability Components (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax assets:
Inventory	$ 25.7	$ 23.3
Receivable allowances	0.2	1.4
Warranty, chargeback, and self - insurance liabilities	50.7	48.4
Other accrued liabilities	27.7	30.0
Deferred compensation	20.9	19.0
Stock-based compensation	14.9	21.2
Loss carryforwards—federal and state	6.8	7.0
Other, net	9.5	8.8
Total deferred income tax assets	156.4	159.1
Valuation allowance	(4.5)	(8.9)
Deferred income tax assets, net of valuation allowance	151.9	150.2
Deferred income tax liabilities:
Long-lived assets (intangibles assets and property)	(269.6)	(225.1)
Other, net	(17.4)	(14.9)
Total deferred income tax liabilities	(287.0)	(240.0)
Net deferred income tax liabilities	$ (135.1)	$ (89.8)