Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands		9 Months Ended
Mar. 09, 2020	Sep. 30, 2020
Goodwill [Roll Forward]
Goodwill - Beginning Balance		$ 3,363,070
Merger/Acquisition		4,476,806
Impact of Change in Foreign Exchange Rates		172,380
Goodwill - Ending Balance		8,012,256
Telx Acquisition
Goodwill [Roll Forward]
Goodwill - Beginning Balance		330,845
Impact of Change in Foreign Exchange Rates		0
Goodwill - Ending Balance		330,845
European Portfolio Acquisition
Goodwill [Roll Forward]
Goodwill - Beginning Balance		440,079
Impact of Change in Foreign Exchange Rates		175
Goodwill - Ending Balance		440,254
DFT Merger
Goodwill [Roll Forward]
Goodwill - Beginning Balance		2,592,146
Impact of Change in Foreign Exchange Rates		0
Goodwill - Ending Balance		2,592,146
InterXion
Goodwill [Roll Forward]
Merger/Acquisition	$ 4,400,000	4,443,856
Impact of Change in Foreign Exchange Rates		171,255
Goodwill - Ending Balance	$ 4,443,856	4,615,111
Other Combinations
Goodwill [Roll Forward]
Merger/Acquisition		32,950
Impact of Change in Foreign Exchange Rates		950
Goodwill - Ending Balance		$ 33,900

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 20
-Section 50
-Paragraph 1
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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

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

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