v3.25.4

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Non-cash income tax benefit	$ (8.1)	$ (82.6)	$ 174.0
Valuation allowance	194.4	196.0
Gross unrecognized tax benefits	10.3	11.7	13.9	$ 13.4
Unrecognized tax benefits that would impact effective tax rate	8.9
Gross decreases related to settlements with taxing authorities	(0.8)	0.0	(0.2)
Payment of penalties	1.5	2.0
Interest on income taxes accrued	1.5	1.4
Tax credit carryforward, foreign	3.1
Deferred tax assets, operating loss carryforwards	762.3
Domestic operating loss carryforward deferred tax assets	378.8
Cash paid for income taxes, net	$ 283.3	120.2	$ 112.4
Switzerland | Income Taxes Paid Benchmark | Geographic Concentration Risk
Income Taxes [Line Items]
Concentration risk, percentage	5.00%
United States | Income Taxes Paid Benchmark | Geographic Concentration Risk
Income Taxes [Line Items]
Concentration risk, percentage	5.00%
Swiss Federal Tax Administration (FTA)
Income Taxes [Line Items]
Non-cash income tax benefit		55.4
Valuation allowance		5.1
Luxembourg Inland Revenue
Income Taxes [Line Items]
Non-cash income tax benefit		$ 93.2
Foreign Country
Income Taxes [Line Items]
Valuation allowance	$ 181.5
United States
Income Taxes [Line Items]
Cash paid for income taxes, net	194.6
Transferable tax credits	62.5
Switzerland
Income Taxes [Line Items]
Cash paid for income taxes, net	$ 16.5

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