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Changes in Carrying Amount of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 3,054,769
Business acquisitions and adjustments to previously recorded goodwill	192,688
Exchange rate effects	144,906
Goodwill, ending balance	3,392,363
North America
Goodwill [Roll Forward]
Goodwill, beginning balance	1,661,800
Business acquisitions and adjustments to previously recorded goodwill	31,964
Exchange rate effects	8,858
Goodwill, ending balance	1,702,622
Europe
Goodwill [Roll Forward]
Goodwill, beginning balance	1,099,976
Business acquisitions and adjustments to previously recorded goodwill	154,926
Exchange rate effects	136,487
Goodwill, ending balance	1,391,389
Specialty
Goodwill [Roll Forward]
Goodwill, beginning balance	292,993
Business acquisitions and adjustments to previously recorded goodwill	5,798
Exchange rate effects	(439)
Goodwill, ending balance	298,352
Rhiag
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 585,415

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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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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- 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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- 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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