Business Segments (Schedule Of Segment Revenue And Segment Operating Profit) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information
Revenue		$ 2,913.0	$ 3,125.2
Total segment operating profit		216.1	287.9
Corporate expense	[1]	(93.6)	(59.8)
Net interest expense		(88.2)	(87.4)
Total corporate items		(181.8)	(147.2)
Income (loss) before income taxes	[2]	34.3	140.7
Subsea
Segment Reporting Information
Revenue		1,185.3	1,180.2	[3]
Onshore/Offshore
Segment Reporting Information
Revenue		1,335.1	1,573.4
Surface Technologies
Segment Reporting Information
Revenue		392.6	371.6
Operating Segments | Subsea
Segment Reporting Information
Revenue		1,185.3	1,180.2
Total segment operating profit		49.9	54.4
Operating Segments | Onshore/Offshore
Segment Reporting Information
Revenue		1,335.1	1,573.4
Total segment operating profit		155.7	202.9
Operating Segments | Surface Technologies
Segment Reporting Information
Revenue		392.6	371.6
Total segment operating profit		$ 10.5	$ 30.6

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

[2] Includes amounts attributable to noncontrolling interests.

[3] We revised the condensed consolidated statement of operations to correct the classification of service revenue and product revenue in the amount of $153.4 million for three months ended March 31, 2018. See Note 1 to our condensed consolidated financial statements of this Quarterly Report for additional disclosure related to the revision.