BUSINESS SEGMENTS

Management’s determination of our reporting segments was made on the basis of our strategic priorities within each segment and the differences in the products and services we provide, which corresponds to the manner in which our Chief Executive Officer, as our chief operating decision maker, reviews and evaluates operating performance to make decisions about resources to be allocated to the segment.

We report the results of operations in the following segments:


•	Subsea - manufactures and designs products and systems, performs engineering, procurement and project management, and provides services used by oil and gas companies involved in offshore exploration and production of crude oil and natural gas.


•	Onshore/Offshore - designs and builds onshore facilities related to the production, treatment, transformation, and transportation of oil and gas; and designs, manufactures, and installs fixed and floating platforms for the production and processing of oil and gas reserves.


•	Surface Technologies - designs and manufactures systems and provides services used by oil and gas companies involved in land and shallow water exploration and production of crude oil and natural gas; designs, manufactures, and supplies technologically advanced high-pressure valves and fittings for oilfield service companies; and also provides flowback and well testing services.

Segment operating profit is defined as total segment revenue less segment operating expenses. Income (loss) from equity method investments is included in computing segment operating profit. The following items have been excluded in computing segment operating profit: corporate staff expense, net interest income (expense) associated with corporate debt facilities, income taxes, and other revenue and other expense, net.

Segment revenue and segment operating profit were as follows:



	Three Months Ended
	March 31,
(In millions)	2019			2018
Segment revenue
Subsea	$	1,185.3		$	1,180.2
Onshore/Offshore	1,335.1			1,573.4
Surface Technologies	392.6			371.6
Total revenue	$	2,913.0		$	3,125.2

Segment operating profit (loss)
Subsea	$	49.9		$	54.4
Onshore/Offshore	155.7			202.9
Surface Technologies	10.5			30.6
Total segment operating profit	216.1			287.9

Corporate items
Corporate expense^(a)	(93.6		)	(59.8		)
Net interest expense	(88.2		)	(87.4		)
Total corporate items	(181.8		)	(147.2		)
Income before income taxes^(b)	$	34.3		$	140.7


(a)	Corporate expense primarily includes corporate staff expenses, share-based compensation expenses, other employee benefits, certain foreign exchange gains and losses, and merger transaction and integration expenses.


(b)	Includes amounts attributable to noncontrolling interests.

Segment assets were as follows:



(In millions)	March 31, 2019			December 31, 2018
Segment assets
Subsea	$	12,085.7		$	11,037.8
Onshore/Offshore	4,202.8			4,355.2
Surface Technologies	2,963.3			2,825.6
Intercompany eliminations	(26.4		)	(26.4		)
Total segment assets	19,225.4			18,192.2
Corporate ^(a)	6,404.5			6,592.3
Total assets	$	25,629.9		$	24,784.5


(a)	Corporate includes cash, LIFO adjustments, deferred income tax balances, legal provisions, property, plant and equipment not associated with a specific segment, pension assets, and the fair value of derivative financial instruments.