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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 |  |  |  |

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