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Summary of Signficant Accounting Policies Finite-Lived Intangible Assets Acquired as Part of Business Combination (Tables)
 12 Months Ended
Dec. 31, 2021
Acquired Finite-Lived Intangible Assets [Line Items]  
Schedule of Goodwill [Table Text Block]
Intangible Assets

Intangible assets consist primarily of goodwill (the cost of purchased businesses in excess of the fair value of the identifiable net assets acquired) and other specifically identifiable intangible assets, such as trade names, trademarks, customer and supplier relationships, software and other technology related assets, and covenants not to compete.

Goodwill is tested for impairment at least annually. We performed annual impairment tests during the fourth quarters of 2021, 2020 and 2019. Goodwill impairment testing may also be performed on an interim basis when events or circumstances arise that may lead to impairment. The fair value estimates of our reporting units were established using weightings of the results of a discounted cash flow methodology and a comparative market multiples approach.

Based on the annual goodwill impairment test performed in the fourth quarter of 2021, we determined no impairment existed as all of the reporting units had a fair value estimate which exceeded the carrying value by at least 70%.

The changes in the carrying amount of goodwill by reportable segment are as follows (in thousands):
North AmericaEuropeSpecialtyTotal
Balance as of January 1, 2020$1,718,044 $2,280,901 $407,590 $4,406,535 
Business acquisitions and adjustments to previously recorded goodwill
(123)419 5,291 5,587 
Exchange rate effects2,346 176,915 186 179,447 
Balance as of December 31, 2020$1,720,267 $2,458,235 $413,067 $4,591,569 
Business acquisitions and adjustments to previously recorded goodwill
23,410 17,969 43,313 84,692 
Reclassified to net assets held for sale— (269)— (269)
Disposal of business— (479)— (479)
Exchange rate effects893 (136,353)(157)(135,617)
Balance as of December 31, 2021$1,744,570 $2,339,103 $456,223 $4,539,896 
Accumulated impairment losses as of December 31, 2021$(33,244)$— $— $(33,244)
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life [Table Text Block]