Business Segments (Schedule Of Segment Revenue And Segment Operating Profit) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues		$ 3,323.0	$ 3,143.8	$ 2,960.9	$ 3,125.2	$ 3,683.0	$ 4,140.9	$ 3,845.0	$ 3,388.0	$ 12,552.9	$ 15,056.9	$ 9,199.6
Total segment operating profit										(532.7)	1,354.1	766.1
Interest income										121.4	140.8	85.3
Interest expense										(482.3)	(456.0)	(114.1)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	[1]									(1,488.1)	679.7	551.4
Subsea
Segment Reporting Information [Line Items]
Revenues										4,840.0
Onshore/Offshore
Segment Reporting Information [Line Items]
Revenues										6,120.7
Surface Technologies
Segment Reporting Information [Line Items]
Revenues										1,592.2
Operating segments | Subsea
Segment Reporting Information [Line Items]
Revenues										4,840.0	5,877.4	5,850.5
Total segment operating profit										(1,529.5)	460.5	732.0
Operating segments | Onshore/Offshore
Segment Reporting Information [Line Items]
Revenues										6,120.7	7,904.5	3,349.1
Total segment operating profit										824.0	810.9	34.1
Operating segments | Surface Technologies
Segment Reporting Information [Line Items]
Revenues										1,592.2	1,274.6
Total segment operating profit										172.8	82.7
Segment reconciling items
Segment Reporting Information [Line Items]
Revenues											0.4
Corporate
Segment Reporting Information [Line Items]
Corporate expense	[2]									(594.5)	(359.2)	(185.9)
Total corporate items										$ (955.4)	$ (674.4)	$ (214.7)

[1] Includes amounts attributable to noncontrolling interests.

[2] Corporate expense primarily includes corporate staff expenses, legal reserve, stock-based compensation expenses, other employee benefits, certain foreign exchange gains and losses, and merger-related transaction expenses.