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Subsequent Event (Details)
£ in Millions, $ in Millions
Feb. 26, 2019
GBP (£)
Feb. 26, 2019
USD ($)
Feb. 01, 2019
USD ($)
Jan. 19, 2018
GBP (£)
Jan. 19, 2018
USD ($)
Subsequent Event [Line Items]          
Payment for diverted profit tax       £ 31.0 $ 42.0
Subsequent Event          
Subsequent Event [Line Items]          
Consideration received on contract termination     $ 21.0    
Refund from U.K. tax authorities £ 22.1 $ 29.0