Income Taxes - Schedule of Pre-Tax Income (Loss) and Effective Income Tax Rates (Detail) - USD ($) $ in Millions	2 Months Ended	11 Months Ended	12 Months Ended
Dec. 31, 2023	Nov. 15, 2023	Dec. 31, 2024	Dec. 31, 2022
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 2.2	$ (210.1)	$ (190.3)	$ (183.2)
Effective Tax Rate	59.10%	0.10%	22.20%	4.30%
Bermuda
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ (11.3)	$ (90.3)	$ 0.0	$ (76.0)
Effective Tax Rate	0.00%	0.00%	0.00%	0.00%
United States (Federal)
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 14.3	$ (96.9)	$ (183.6)	$ (83.2)
Effective Tax Rate	9.00%	(7.50%)	23.00%	17.90%
United Kingdom
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ (1.3)	$ (23.2)	$ (3.1)	$ 23.4
Effective Tax Rate	0.00%	30.40%	0.00%	27.90%
Barbados
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.1	$ 0.1	$ 0.0	$ (4.5)
Effective Tax Rate	0.00%	0.00%	0.00%	0.00%
Brazil
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.0	$ 0.0	$ 0.0	$ (0.1)
Effective Tax Rate	0.00%	0.00%	0.00%	(422.40%)
United Arab Emirates
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.0	$ 0.3	$ 0.0	$ 1.4
Effective Tax Rate	0.00%	0.00%	0.00%	0.00%
Ireland
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.5	$ (0.1)	$ 0.0	$ (39.1)
Effective Tax Rate	0.00%	0.00%	0.00%	0.00%
Italy
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.1	$ 0.1	$ (3.6)	$ (0.9)
Effective Tax Rate	2.10%	50.30%	(1.00%)	(4.80%)
Malta
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.0	$ 0.0	$ 0.0	$ (4.2)
Effective Tax Rate	0.00%	0.00%	0.00%	0.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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