Litigation (Details) - WesternGeco $ in Millions	1 Months Ended	9 Months Ended	56 Months Ended
	Jun. 30, 2009 Patent	Sep. 30, 2019 Patent	Dec. 31, 2018 USD ($)	May 31, 2014 USD ($)
Loss Contingencies [Line Items]
Number of patent apparatus claims contained	4
Number of patents invalidated		4
Number of patents pending		5
Judicial Ruling
Loss Contingencies [Line Items]
Amount of royalty damages paid | $			$ 25.8
Judicial Ruling | Lost Profits
Loss Contingencies [Line Items]
Loss contingency accrual | $			$ 98.0	$ 123.8