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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