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	378.2	162.5	212.1	3.6
Distributions	(318.7)	(131.5)	(184.1)	(3.1)
Partners' capital at Sep. 30, 2011	269.5	31.9	236.5	1.1
Partners' capital at Dec. 31, 2011	269.3	33.4	234.8	1.1
Increase (Decrease) in Partners' Capital
Net earnings	410.8	176.5	230.3	4.0
Distributions	(422.1)	(182.2)	(235.8)	(4.1)
Partners' capital at Sep. 30, 2012	$ 258.0	$ 27.7	$ 229.3	$ 1.0