The following table presents our investments in unconsolidated affiliates by business segment at the dates indicated. We account for these investments using the equity method.

	Ownership Interest at June 30, 2017	June 30, 2017		December 31, 2016
NGL Pipelines & Services:
Venice Energy Service Company, L.L.C.	13.1%	$	25.9	$	24.8
K/D/S Promix, L.L.C.	50%		32.2		33.7
Baton Rouge Fractionators LLC	32.2%		17.6		17.3
Skelly-Belvieu Pipeline Company, L.L.C.	50%		37.1		38.9
Texas Express Pipeline LLC	35%		327.8		331.9
Texas Express Gathering LLC	45%		36.5		35.8
Front Range Pipeline LLC	33.3%		166.5		165.4
Delaware Basin Gas Processing LLC	50%		108.2		102.6
Crude Oil Pipelines & Services:
Seaway Crude Pipeline Company LLC	50%		1,380.5		1,393.8
Eagle Ford Pipeline LLC	50%		379.1		377.9
Eagle Ford Terminals Corpus Christi LLC	50%		63.2		52.9
Natural Gas Pipelines & Services:
White River Hub, LLC	50%		21.3		21.7
Petrochemical & Refined Products Services:
Centennial Pipeline LLC	50%		60.7		62.3
Other	Various		4.7		18.3
Total investments in unconsolidated affiliates		$	2,661.3	$	2,677.3

The following table presents our equity in income (loss) of unconsolidated affiliates by business segment for the periods indicated:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2017			2016			2017			2016
NGL Pipelines & Services	$	19.0		$	14.0		$	34.5		$	29.1
Crude Oil Pipelines & Services		89.2			65.8			170.4			155.9
Natural Gas Pipelines & Services		0.9			0.9			1.9			1.9
Petrochemical & Refined Products Services		(2.1	)		(4.3	)		(5.0	)		(9.4	)
Total	$	107.0		$	76.4		$	201.8		$	177.5

The following table presents our unamortized excess cost amounts by business segment at the dates indicated:

	June 30, 2017		December 31, 2016
NGL Pipelines & Services	$	23.5	$	24.1
Crude Oil Pipelines & Services		18.6		19.0
Petrochemical & Refined Products Services		1.9		2.1
Total	$	44.0	$	45.2

Combined results of operations data for the periods indicated for our unconsolidated affiliates are summarized in the following table (all data presented on a 100% basis):

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2017		2016		2017		2016
Income Statement Data:
Revenues	$	371.9	$	317.5	$	715.1	$	663.0
Operating income		229.8		181.7		433.5		395.4
Net income		237.6		178.3		440.5		393.5