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Debt (Term Loan) (Details) £ in Millions, $ in Millions	Dec. 31, 2019 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2016 GBP (£)
Term Loan
Debt Instrument
Loans Payable to Bank, Current		£ 16.0
Debt Instrument, Annual Principal Payment		£ 13.1
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%	50.00%