Income Taxes - Schedule of Pre-Tax Income (Loss) and Effective Income Tax Rates (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 12.0	$ 31.2
Effective Tax Rate	109.70%	4.30%
Bermuda
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ (0.2)	$ 5.0
Effective Tax Rate	0.00%	0.00%
United States
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 38.8	$ 41.3
Effective Tax Rate	21.90%	15.70%
United Kingdom
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 5.0	$ (18.3)
Effective Tax Rate	80.80%	28.10%
Brazil
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ (0.1)	$ 1.6
Effective Tax Rate	(422.40%)	0.00%
United Arab Emirates
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.6	$ 0.3
Effective Tax Rate	0.00%	0.00%
Ireland
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ (33.3)	$ (0.1)
Effective Tax Rate	0.00%	0.00%
Italy
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 0.1	$ 0.9
Effective Tax Rate	138.10%	0.00%
Malta
Income Tax Examination [Line Items]
Pre-Tax Income (Loss)	$ 1.1	$ 0.5
Effective Tax Rate	0.00%	0.00%