Business Segments (Segment Operating Capital Employed And Segment Assets) (Details) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Segment Reporting Information
Total assets		$ 25,512.7	$ 24,784.5
Operating Segments
Segment Reporting Information
Total assets		19,507.4	18,192.2
Operating Segments | Subsea
Segment Reporting Information
Total assets		12,237.1	11,037.8
Operating Segments | Onshore/Offshore
Segment Reporting Information
Total assets		4,311.8	4,355.2
Operating Segments | Surface Technologies
Segment Reporting Information
Total assets		2,988.2	2,825.6
Intercompany eliminations
Segment Reporting Information
Total assets		(29.7)	(26.4)
Corporate
Segment Reporting Information
Total assets	[1]	$ 6,005.3	$ 6,592.3

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