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Debt (Term Loan) (Details)
£ in Millions, $ in Millions
Dec. 31, 2019
USD ($)
Dec. 31, 2016
GBP (£)
Term Loan    
Debt Instrument    
Debt Instrument, Face amount | £   £ 160.0
Interest rate, stated percentage   2.813%
TOP CV    
Debt Instrument    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | $ $ 203.1  
Subsea | TOP CV    
Debt Instrument    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage 50.00%