Business Segments (Schedule Of Segment Revenue And Segment Operating Profit) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information
Total revenue		$ 4,140.9	$ 2,375.7	$ 11,373.9	$ 7,151.9
Total segment operating profit		358.2	352.9	976.2	809.7
Net interest expense		(86.3)	(0.4)	(240.5)	(21.4)
Income before income taxes	[1]	229.6	404.2	511.4	679.9
Operating segments | Subsea
Segment Reporting Information
Total revenue		1,478.2	1,560.3	4,585.2	4,624.7
Total segment operating profit		102.8	282.0	393.1	669.9
Operating segments | Onshore/Offshore
Segment Reporting Information
Total revenue		2,308.1	815.4	5,885.0	2,527.2
Total segment operating profit		206.4	70.9	553.7	139.8
Operating segments | Surface Technologies
Segment Reporting Information
Total revenue		353.9		902.3
Total segment operating profit		49.0		29.4
Segment reconciling items
Segment Reporting Information
Total revenue	[2]	0.7		1.4
Corporate items
Segment Reporting Information
Corporate income (expense)	[1]	(42.3)	51.7	(224.3)	(108.4)
Net interest expense		(86.3)	(0.4)	(240.5)	(21.4)
Total corporate items		$ (128.6)	$ 51.3	$ (464.8)	$ (129.8)

[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.