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Changes in Carrying Amount of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 3,536,511
Business acquisitions and adjustments to previously recorded goodwill	(4,134)
Exchange rate effects	39,821
Ending balance	3,572,198
North America
Goodwill [Roll Forward]
Beginning balance	1,709,354
Business acquisitions and adjustments to previously recorded goodwill	584
Exchange rate effects	(2,891)
Ending balance	1,707,047
Europe
Goodwill [Roll Forward]
Beginning balance	1,414,898
Business acquisitions and adjustments to previously recorded goodwill	259
Exchange rate effects	42,510
Ending balance	1,457,667
Specialty
Goodwill [Roll Forward]
Beginning balance	412,259
Business acquisitions and adjustments to previously recorded goodwill	(4,977)
Exchange rate effects	202
Ending balance	$ 407,484

X

- Definition

The aggregate amount of goodwill acquired in the period and purchase price allocation adjustments for acquisitions made in prior periods. The value is stated at fair value based on the purchase price allocation.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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