Agreement of Limited Partnership (Tables)

12 Months Ended

Dec. 31, 2013

Agreement of Limited Partnership

Summary of available cash distribution

	Income and Distribution Allocation
	Target Limit		Target Increment		Common Units			Class B Common Units			General Partner			Total
Minimum Quarterly Distributions	$	0.605	$	0.605		98.990	%		0.985	%		0.025	%		100.00	%
First Target		0.715		0.110		98.990	%		0.985	%		0.025	%		100.00	%
Second Target		0.825		0.110		85.859	%		0.985	%		13.156	%		100.00	%
Third Target		1.045		0.220		75.758	%		0.985	%		23.257	%		100.00	%
Final Target and Beyond		>1.045		—		50.505	%		0.985	%		48.510	%		100.00	%

Schedule of the quarterly cash distributions paid to the unitholders and the General Partner

		Common Units				Class B Common Units				General Partner
		Total		Per unit		Total		Per unit		Total
		(in millions, except per unit amounts)
2013
	First Quarter	$	67.2	$	3.63	$	1.2	$	6.25	$	49.5
	Second Quarter		86.6		4.68		1.5		8.31		68.6
	Third Quarter		74.4		4.02		1.3		7.00		56.5
	Fourth Quarter		37.4		2.02		0.6		3.09		20.4
2012
	First Quarter	$	83.8	$	4.53	$	1.5	$	8.01	$	65.9
	Second Quarter		74.0		4.00		1.3		6.96		56.2
	Third Quarter		77.9		4.21		1.3		7.39		60.2
	Fourth Quarter		76.4		4.12		1.3		7.21		58.5