Business Segments (Schedule Of Segment Revenue And Segment Operating Profit) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information
Revenue		$ 3,335.1	$ 3,143.8	$ 9,682.3	$ 9,229.9
Total segment operating profit		211.1	375.0	821.4	961.6
Corporate expense	[1]	(128.8)	(68.1)	(361.4)	(200.9)
Net interest expense		116.5	106.0	345.3	244.3
Total corporate items		(245.3)	(174.1)	(706.7)	(445.2)
Income (loss) before income taxes	[2]	(34.2)	200.9	114.7	516.4
Operating Segments | Subsea
Segment Reporting Information
Revenue		1,342.2	1,209.1	4,036.2	3,606.7
Total segment operating profit		(79.6)	79.7	65.0	210.0
Operating Segments | Onshore/Offshore
Segment Reporting Information
Revenue		1,596.3	1,532.5	4,436.4	4,448.3
Total segment operating profit		284.6	243.4	714.3	617.6
Operating Segments | Surface Technologies
Segment Reporting Information
Revenue		396.6	402.2	1,209.7	1,174.9
Total segment operating profit		$ 6.1	$ 51.9	$ 42.1	$ 134.0

[1] Corporate expense primarily includes corporate staff expenses, legal reserve, share-based compensation expenses, other employee benefits, certain foreign exchange gains and losses, merger transaction, integration expenses, and separation expenses.

[2] Includes amounts attributable to noncontrolling interests.