Business Segments (Schedule Of Segment Revenue And Segment Operating Profit) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information
Total revenue	$ 3,125.2	$ 3,388.0
Total segment operating profit	287.9	178.4
Corporate expense(a)	(59.8)	(59.7)
Net interest expense	(87.4)	(82.1)
Total corporate items	(147.2)	(141.8)
Income before income taxes	140.7	36.6
Subsea
Segment Reporting Information
Total revenue	1,180.2	1,376.7
Total segment operating profit	54.4	54.2
Onshore/Offshore
Segment Reporting Information
Total revenue	1,573.4	1,764.0
Total segment operating profit	202.9	142.8
Surface Technologies
Segment Reporting Information
Total revenue	371.6	248.4
Total segment operating profit	$ 30.6	(18.6)
Other revenue
Segment Reporting Information
Total revenue		$ (1.1)