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Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss		$ (33,244)
Amount that fair value exceeds carrying value		25.00%
Goodwill [Roll Forward]
Beginning balance		$ 4,381,458	$ 3,536,511
Business acquisitions and adjustments to previously recorded goodwill		54,012	972,890
Goodwill reclassified to assets held for sale		(4,721)
Goodwill, Written off Related to Sale of Business Unit		(1,919)
Impairment of goodwill	$ (33,000)		33,244
Exchange rate effects		(22,295)	(94,699)
Ending balance	4,381,458	4,406,535	4,381,458
North America [Member]
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss		(33,244)
Goodwill [Roll Forward]
Beginning balance		1,673,532	1,709,354
Business acquisitions and adjustments to previously recorded goodwill		38,913	6,805
Goodwill reclassified to assets held for sale		0
Goodwill, Written off Related to Sale of Business Unit		0
Impairment of goodwill			33,244
Exchange rate effects		5,599	(9,383)
Ending balance	1,673,532	1,718,044	1,673,532
Europe [Member]
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss		0
Goodwill [Roll Forward]
Beginning balance		2,300,289	1,414,898
Business acquisitions and adjustments to previously recorded goodwill		15,099	970,923
Goodwill reclassified to assets held for sale		(4,721)
Goodwill, Written off Related to Sale of Business Unit		(1,919)
Impairment of goodwill			0
Exchange rate effects		(27,847)	(85,532)
Ending balance	2,300,289	2,280,901	2,300,289
Specialty
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss		0
Goodwill [Roll Forward]
Beginning balance		407,637	412,259
Business acquisitions and adjustments to previously recorded goodwill		0	(4,838)
Goodwill reclassified to assets held for sale		0
Goodwill, Written off Related to Sale of Business Unit		0
Impairment of goodwill			0
Exchange rate effects		(47)	216
Ending balance	407,637	407,590	407,637
Stahlgruber [Member]
Goodwill [Roll Forward]
Beginning balance		$ 908,253
Ending balance	$ 908,253		$ 908,253

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