Business Segments (Schedule Of Segment Revenue And Segment Operating Profit) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information
Total revenue		$ 3,845.0	$ 2,370.5	$ 7,233.0	$ 4,776.2
Total segment operating profit		439.6	222.0	618.0	456.8
Net interest expense		(72.1)	(7.7)	(154.2)	(21.0)
Income before income taxes	[1]	245.2	109.2	281.8	275.7
Operating segments | Subsea
Segment Reporting Information
Total revenue		1,730.3	1,547.2	3,107.0	3,064.4
Total segment operating profit		236.1	191.5	290.3	387.9
Operating segments | Onshore/Offshore
Segment Reporting Information
Total revenue		1,812.9	823.3	3,576.9	1,711.8
Total segment operating profit		204.5	30.5	347.3	68.9
Operating segments | Surface Technologies
Segment Reporting Information
Total revenue		300.0		548.4
Total segment operating profit		(1.0)		(19.6)
Segment reconciling items
Segment Reporting Information
Total revenue	[2]	1.8		0.7
Corporate items
Segment Reporting Information
Corporate income (expense)	[1]	(122.3)	(105.1)	(182.0)	(160.1)
Net interest expense		(72.1)	(7.7)	(154.2)	(21.0)
Total corporate items		$ (194.4)	$ (112.8)	$ (336.2)	$ (181.1)

[1] Includes amounts attributable to noncontrolling interests.

[2] Corporate expense primarily includes corporate staff expenses, stock-based compensation expenses, other employee benefits, certain foreign exchange gains and losses, and merger-related transaction expenses.