Equity Method Investments (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Schedule of Equity Method Investments
Income from equity affiliates		$ 9.4	$ 25.5	[1]
Subsea
Schedule of Equity Method Investments
Income from equity affiliates		$ 9.4	1.9	[1]
Onshore/Offshore
Schedule of Equity Method Investments
Income from equity affiliates	[1]		$ 23.6

[1] Restated balances related to adjustments to equity interests due to the use of incorrect foreign exchange rates.