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Taxation - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets |  |
Net operating losses | $ 13.0 | $ 44.8
Excess of tax basis over book basis of property, plant and equipment | 53.6 | 29.7
Other | 16.0 | 10.7
Deferred tax asset | 82.6 | 85.2
Less: Valuation allowance | (81.9) | (85.0)
Net deferred tax assets | 0.7 | 0.2
Deferred tax liabilities |  |
Deferred tax liabilities | 0.0 | 0.0
Net deferred tax asset | $ 0.7 | $ 0.2

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