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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 |  |  |  |  |

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