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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Income tax benefit at statutory tax rate of zero percent	$ 0.0	$ 0.0	$ 0.0
Overseas statutory tax rates differential	56.3	16.8	(0.9)
Base erosion and anti-abuse (BEAT) expense	0.9	2.3	6.1
Prior year adjustments	6.9	(2.9)	0.5
Introduction of Bermuda corporate income tax	(201.1)	0.0	0.0
Change in valuation allowance (2)	4.0	(98.9)	9.6
Impact of unrecognized tax benefits	0.0	0.0	0.0
Australian non-resident withholding tax	0.0	1.5	0.6
Foreign exchange	(1.3)	(0.3)	(1.5)
Non-deductible expenses	2.5	2.4	2.4
Impact of changes in statutory tax rates	(0.3)	(5.7)	(11.5)
Tax effect of OCI in income statement	0.0	6.7	0.0
Total tax expense/(benefit)	$ (132.1)	$ (78.1)	$ 5.3

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Amount of reported income tax expense from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to base erosion and anti-abuse tax (BEAT).

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