Equity Method Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Equity Method Investments
Income from equity affiliates	$ 14.2	$ 40.2	$ 28.1	$ 54.2
Subsea
Schedule of Equity Method Investments
Income from equity affiliates	11.3	19.7	26.2	36.3
Onshore/Offshore
Schedule of Equity Method Investments
Income from equity affiliates	$ 2.9	$ 20.5	$ 1.9	$ 17.9