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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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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 (4) | (0.3) | (5.7) | (11.5)
Effective Income Tax Rate Reconciliation, Tax Effect of OCI, Amount | 0.0 | 6.7 | 0.0
Total tax expense/(benefit) | $ (132.1) | $ (78.1) | $ 5.3

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- Definition 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). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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