Income Taxes - Schedule of Pre-Tax Income (Loss) and Effective Income Tax Rates (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ (42.3)	$ 12.0
Effective Tax Rate	20.10%	109.70%
Bermuda
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ (15.2)	$ (0.2)
Effective Tax Rate	0.00%	0.00%
United States
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ (7.3)	$ 38.8
Effective Tax Rate	19.70%	21.90%
United Kingdom
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ (20.1)	$ 5.0
Effective Tax Rate	35.40%	80.80%
Barbados
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.0	$ 0.0
Effective Tax Rate	0.00%	0.00%
Brazil
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.0	$ (0.1)
Effective Tax Rate	0.00%	(422.40%)
United Arab Emirates
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.3	$ 0.6
Effective Tax Rate	0.00%	0.00%
Ireland
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.0	$ (33.3)
Effective Tax Rate	0.00%	0.00%
Italy
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.0	$ 0.1
Effective Tax Rate	0.00%	138.10%
Malta
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.0	$ 1.1
Effective Tax Rate	0.00%	0.00%