Business Segments (Segment Operating Capital Employed And Segment Assets) (Detail) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information
Total assets		$ 29,615.9	$ 18,689.7
Operating segments
Segment Reporting Information
Total assets		20,685.8	11,052.4
Operating segments | Subsea
Segment Reporting Information
Total assets		13,946.1	7,823.1
Operating segments | Onshore/Offshore
Segment Reporting Information
Total assets		4,888.9	3,229.3
Operating segments | Surface Technologies
Segment Reporting Information
Total assets		1,871.5
Intercompany eliminations
Segment Reporting Information
Total assets		(20.7)
Corporate items
Segment Reporting Information
Total assets	[1]	$ 8,930.1	$ 7,637.3

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