Business Segments (Segment Operating Capital Employed And Segment Assets) (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information
Total assets		$ 25,629.9	$ 24,784.5
Operating Segments
Segment Reporting Information
Total assets		19,225.4	18,192.2
Operating Segments | Subsea
Segment Reporting Information
Total assets		12,085.7	11,037.8
Operating Segments | Onshore/Offshore
Segment Reporting Information
Total assets		4,202.8	4,355.2
Operating Segments | Surface Technologies
Segment Reporting Information
Total assets		2,963.3	2,825.6
Intercompany eliminations
Segment Reporting Information
Total assets		(26.4)	(26.4)
Corporate
Segment Reporting Information
Total assets	[1]	$ 6,404.5	$ 6,592.3

[1] Corporate includes cash, LIFO adjustments, deferred income tax balances, legal provisions, property, plant and equipment not associated with a specific segment, pension assets, and the fair value of derivative financial instruments.