Impairment, Restructuring and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Restructuring and Impairment
Impairment, restructuring and other expenses	$ 140.3	$ 9.7	$ 166.0	$ 32.6
Other Asset Impairment Charges	125.1
Subsea
Restructuring and Impairment
Impairment, restructuring and other expenses	131.2	5.0	138.0	19.1
Onshore/Offshore
Restructuring and Impairment
Impairment, restructuring and other expenses	5.2	(0.2)	11.1	(5.8)
Surface Technologies
Restructuring and Impairment
Impairment, restructuring and other expenses	0.7	1.3	3.4	8.0
Corporate and other
Restructuring and Impairment
Impairment, restructuring and other expenses	$ 3.2	$ 3.6	$ 13.5	$ 11.3