Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill - Beginning Balance	$ 4,348,007	$ 3,389,595
Merger/Acquisition		982,667
Deconsolidation	(967,189)	0
Goodwill Adjustments	(9,436)
Impact of Change in Foreign Exchange Rates	(8,312)	(24,255)
Goodwill - Ending Balance	3,363,070	4,348,007
Telx Acquisition
Goodwill [Roll Forward]
Goodwill - Beginning Balance	330,845	330,845
Deconsolidation	0	0
Impact of Change in Foreign Exchange Rates	0	0
Goodwill - Ending Balance	330,845	330,845
European Portfolio Acquisition
Goodwill [Roll Forward]
Goodwill - Beginning Balance	442,349	466,604
Deconsolidation	0	0
Goodwill Adjustments	(9,436)
Impact of Change in Foreign Exchange Rates	7,166	(24,255)
Goodwill - Ending Balance	440,079	442,349
DFT Merger
Goodwill [Roll Forward]
Goodwill - Beginning Balance	2,592,146	2,592,146
Deconsolidation	0	0
Impact of Change in Foreign Exchange Rates	0	0
Goodwill - Ending Balance	2,592,146	2,592,146
Ascenty
Goodwill [Roll Forward]
Goodwill - Beginning Balance	982,667	0
Merger/Acquisition		982,667
Deconsolidation	(967,189)	0
Impact of Change in Foreign Exchange Rates	$ (15,478)	0
Goodwill - Ending Balance		$ 982,667

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.

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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.

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

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