Basis of Presentation and Significant Accounting Policies - Narrative (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020	Sep. 01, 2021 center	Nov. 02, 2020 center	Oct. 01, 2020 center	Jan. 08, 2020 center
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective income tax rate, continuing operations	15.20%	24.70%
Unrecognized tax benefits | $	$ 70.0
Non-cash charge from revaluation of deferred tax liabilities | $	10.9
GPX India
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Data centers purchased | center			2
Bell
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Data centers purchased | center				1	12
Axtel
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Data centers purchased | center						3
Metronode
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unrecognized tax benefits, resulting from pre-acquisition uncertain tax position | $	$ 32.3