Amount for accounts payable to related parties.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Related Party Transactions Schedule of Related Party Transactions (Tables) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Trade receivables	$ 77.2		$ 77.2		$ 76.8
Trade payables	27.3		27.3		51.1
Revenue	29.5	$ 102.5	66.4	$ 226.2
Expenses	9.2	25.1	29.7	77.8
TTSJV W.L.L. \| Equity Method Investee
Related Party Transaction [Line Items]
Trade receivables	16.8		16.8		22.4
Revenue	13.0	22.7	28.6	75.5
TOP CV \| Equity Method Investee
Related Party Transaction [Line Items]
Revenue		2.7		4.0
Serimax Holdings SAS \| Equity Method Investee
Related Party Transaction [Line Items]
Expenses	0.3	0.2	0.5	17.7
Chiyoda
Related Party Transaction [Line Items]
Trade payables	16.6		16.6		24.8
Expenses		3.4		17.6
JGC Corporation
Related Party Transaction [Line Items]
Trade payables	4.2		4.2		15.1
Expenses	0.2	4.6	0.4	18.9
Arkema S.A. \| Director
Related Party Transaction [Line Items]
Expenses	2.4	9.8	2.8	9.8
IFP Energies nouvelles \| Director
Related Party Transaction [Line Items]
Trade payables	2.2		2.2		2.4
Expenses	0.7		1.8	1.0
Dofcon Navegacao
Related Party Transaction [Line Items]
Expenses	3.8		11.8	0.4
Dofcon Navegacao \| Equity Method Investee
Related Party Transaction [Line Items]
Trade payables	1.5		1.5		2.1
Revenue	0.0	1.6	0.6	5.7
Magma Global Limited \| Equity Method Investee
Related Party Transaction [Line Items]
Expenses	0.9	1.3	1.6	3.2
TP JGC Coral France SNC \| Equity Method Investee
Related Party Transaction [Line Items]
Trade receivables	35.9		35.9		40.1
Revenue	6.6	51.0	19.2	77.7
Anadarko Petroleum Company \| Director
Related Party Transaction [Line Items]
Revenue		12.1		40.8
Others \| Other Affiliates
Related Party Transaction [Line Items]
Trade receivables	19.1		19.1		14.3
Trade payables	2.8		2.8		6.7
Revenue	7.5	12.4	13.6	22.5
Expenses	0.9	5.8	10.8	9.2
Novarctic SNC \| Equity Method Investee
Related Party Transaction [Line Items]
Trade receivables	5.4		5.4		$ 0.0
Techdof Brasil AS \| Equity Method Investee
Related Party Transaction [Line Items]
Revenue	$ 2.4	$ 0.0	$ 4.4	$ 0.0