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Taxation - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Examination [Line Items]      
Effective income tax rate (5.30%) (5.37%) (3.89%)
Loss before income taxes $ 183.3 $ 301.4 $ 287.9
Unrecognized tax benefits, interest and penalties 0.4 0.5 $ 0.3
Unrecognized tax benefits, income tax penalties and interest accrued 10.8 $ 10.4  
Her Majesty's Revenue and Customs (HMRC)      
Income Tax Examination [Line Items]      
Deferred tax assets, operating loss carryforwards, not subject to expiration 40.2    
Increase in gross deferred tax asset 19.0    
Valuation allowance, deferred tax asset, increase (decrease), amount $ 0.0