CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (USD $) In Millions, unless otherwise specified	Total	General Partner's Interest	Common Units	Class B Common Units
Partners' capital at Dec. 31, 2010	$ 210.0	$ 0.9	$ 208.5	$ 0.6
Increase (Decrease) in Partners' Capital
Net earnings	249.8	107.7	139.7	2.4
Distributions	(196.4)	(79.8)	(114.7)	(1.9)
Partners' capital at Jun. 30, 2011	263.4	28.8	233.5	1.1
Partners' capital at Dec. 31, 2011	269.3	33.4	234.8	1.1
Increase (Decrease) in Partners' Capital
Net earnings	279.0	119.9	156.4	2.7
Distributions	(282.7)	(122.2)	(157.8)	(2.7)
Partners' capital at Jun. 30, 2012	$ 265.6	$ 31.1	$ 233.4	$ 1.1