Acquisitions and Dispositions of Businesses (Acquired assets and liabilities assumed) (Details 1) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,388,279	$ 1,297,712	$ 1,299,710
Floor plan payables	(25,800)
Pension and other post retirement benefits liabilities			(59,100)
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Accounts receivable	6,762	2,344	12,502
Inventory	34,134	1,268	25,253
Property, plant and equipment	56,391	1,518	29,921
Lease right-of-use assets	100,364	0	0
Goodwill	84,515	41,840	143,149
Indefinite-lived intangible assets	46,900	0	33,800
Amortized intangible assets	21,291	78,427	170,658
Other assets	8,308	5,198	1,880
Floor plan payables	(25,755)	0	0
Pension and other post retirement benefits liabilities	0	0	(59,116)
Other liabilities	(42,555)	(7,678)	(12,177)
Deferred income taxes	(2,703)	(4,900)	(37,289)
Current and noncurrent lease liabilities	(100,990)	0	0
Redeemable noncontrolling interest	(1,715)	0	(3,666)
Noncontrolling interest	(1,154)	0	0
Aggregate purchase price, net of cash acquired	$ 183,793	$ 118,017	$ 304,915