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