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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Tax Note Textuals [Line Items] |  |  |
Deconsolidation Gain or Loss, Tax Amount | $ 116.9 |  |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | 196.4 |  |
Net operating loss carryforwards in Luxembourg | 208.8 |  |
Excess Tax benefit from stock activity | 3.2 | $ 3.0 | $ 4.6
Estimated change in unrecognized tax benefits | 1.0 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense | (0.7) | (2.0) | (0.3)
Interest accrued from income tax examinations | 0.0 | 0.9 | $ 2.9
InTelCo |  |  |
Tax Note Textuals [Line Items] |  |  |
Deconsolidation Gain or Loss, Tax Amount | 116.9 |  |
Continuing Operations [Member] |  |  |
Tax Note Textuals [Line Items] |  |  |
Unrecognized Tax Benefits, Period Increase (Decrease) | 14.3 |  |
Unrecognize tax benefit, audit settlements | 9.2 |  |
Unrecognized tax benefit, release of prior year tax position | 5.1 |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 2.8 |  |
Luxembourg Deferred Tax Assets |  |  |
Tax Note Textuals [Line Items] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | (25.9) |
German and UK Deferred Tax Assets |  |  |
Tax Note Textuals [Line Items] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | $ 21.7 |

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