Business Segments (Segment Operating Capital Employed And Segment Assets) (Details) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information
Total assets		$ 24,779.7	$ 24,784.5
Operating Segments
Segment Reporting Information
Total assets		19,010.3	18,192.2
Operating Segments | Subsea
Segment Reporting Information
Total assets		11,817.0	11,037.8
Operating Segments | Onshore/Offshore
Segment Reporting Information
Total assets		4,231.4	4,355.2
Operating Segments | Surface Technologies
Segment Reporting Information
Total assets		2,992.5	2,825.6
Intercompany eliminations
Segment Reporting Information
Total assets		(30.6)	(26.4)
Corporate
Segment Reporting Information
Total assets	[1]	$ 5,769.4	$ 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.