Revenue Disaggregation of Revenue, Geographical (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
Disaggregation of Revenue [Line Items]
Lease and other revenue										$ 222.7	$ 194.6	$ 0.0
Total revenue		$ 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
Service [Member]
Disaggregation of Revenue [Line Items]
Product revenue										9,765.0	12,210.5	9,128.7
Product [Member]
Disaggregation of Revenue [Line Items]
Product revenue										2,565.2	$ 2,651.8	$ 70.9
Subsea
Disaggregation of Revenue [Line Items]
Product revenue										4,721.8
Lease and other revenue	[1]									118.2
Total revenue										4,840.0
Subsea | Service [Member]
Disaggregation of Revenue [Line Items]
Product revenue										3,394.5
Subsea | Product [Member]
Disaggregation of Revenue [Line Items]
Product revenue										1,327.3
Subsea | Europe, Russia, Central Asia [Member]
Disaggregation of Revenue [Line Items]
Product revenue										1,528.1
Subsea | Americas [Member]
Disaggregation of Revenue [Line Items]
Product revenue										1,721.5
Subsea | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Product revenue										532.9
Subsea | Africa [Member]
Disaggregation of Revenue [Line Items]
Product revenue										758.1
Subsea | Middle East [Member]
Disaggregation of Revenue [Line Items]
Product revenue										181.2
Onshore/Offshore
Disaggregation of Revenue [Line Items]
Product revenue										6,120.7
Total revenue										6,120.7
Onshore/Offshore | Service [Member]
Disaggregation of Revenue [Line Items]
Product revenue										6,120.7
Onshore/Offshore | Europe, Russia, Central Asia [Member]
Disaggregation of Revenue [Line Items]
Product revenue										3,506.1
Onshore/Offshore | Americas [Member]
Disaggregation of Revenue [Line Items]
Product revenue										365.1
Onshore/Offshore | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Product revenue										1,236.1
Onshore/Offshore | Africa [Member]
Disaggregation of Revenue [Line Items]
Product revenue										252.7
Onshore/Offshore | Middle East [Member]
Disaggregation of Revenue [Line Items]
Product revenue										760.7
Surface Technologies
Disaggregation of Revenue [Line Items]
Product revenue										1,487.7
Lease and other revenue	[1]									104.5
Total revenue										1,592.2
Surface Technologies | Service [Member]
Disaggregation of Revenue [Line Items]
Product revenue										249.8
Surface Technologies | Product [Member]
Disaggregation of Revenue [Line Items]
Product revenue										1,237.9
Surface Technologies | Europe, Russia, Central Asia [Member]
Disaggregation of Revenue [Line Items]
Product revenue										227.7
Surface Technologies | Americas [Member]
Disaggregation of Revenue [Line Items]
Product revenue										865.5
Surface Technologies | Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Product revenue										123.2
Surface Technologies | Africa [Member]
Disaggregation of Revenue [Line Items]
Product revenue										57.9
Surface Technologies | Middle East [Member]
Disaggregation of Revenue [Line Items]
Product revenue										$ 213.4

[1] Represents revenue not subject to ASC Topic 606.