Impairment, Restructuring and Other Expense Impairment and Restructuring Narratives (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) employee	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Restructuring and Impairment [Line Items]
Other Asset Impairment Charges	$ 495.4	$ 372.9
Asset Impairment Charges	2,484.1	1,792.6	$ 34.3
Goodwill, Impairment Loss	$ 1,988.7	1,383.0
Restructuring and Related Cost, Number of Positions Eliminated | employee	1,600
Restructuring and Related Cost, Cost Incurred to Date	$ 32.4
Technip Odebrecht PLSV CV
Restructuring and Impairment [Line Items]
Other Asset Impairment Charges	84.2
Business Combination, Separately Recognized Transactions, Net Gains and Losses	(0.9)
Business Combination, Bargain Purchase, Gain Recognized, Amount	83.3
Subsea
Restructuring and Impairment [Line Items]
Asset Impairment Charges	1,798.6	1,784.2	$ 11.5
Goodwill, Impairment Loss	$ (1,321.9)	$ 1,383.0
Technip Odebrecht PLSV CV | Subsea
Restructuring and Impairment [Line Items]
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage	50.00%
Plant, property and equipment
Restructuring and Impairment [Line Items]
Other Asset Impairment Charges	$ 153.8
Machinery and equipment
Restructuring and Impairment [Line Items]
Other Asset Impairment Charges	$ 168.9