Basis of Presentation and Significant Accounting Policies - Narrative (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020	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	5.90%	22.90%
Unrecognized tax benefits	$ 72.0
Non-cash charge from revaluation of deferred tax liabilities	11.0
Bell Data Centers
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	$ 33.6