Impairment, Restructuring and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring and Impairment
Impairment, restructuring and other expenses	$ 16.5	$ 11.5
Subsea
Restructuring and Impairment
Impairment, restructuring and other expenses	2.3	3.1
Onshore/Offshore
Restructuring and Impairment
Impairment, restructuring and other expenses	3.8	3.5
Surface Technologies
Restructuring and Impairment
Impairment, restructuring and other expenses	1.5	2.4
Corporate and other
Restructuring and Impairment
Impairment, restructuring and other expenses	$ 8.9	$ 2.5