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, 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
Partners' capital at Dec. 31, 2012	271.8	32.3	238.3	1.2
Increase (Decrease) in Partners' Capital
Net earnings	388.8	162.2	222.8	3.8
Distributions	(406.8)	(174.6)	(228.2)	(4.0)
Partners' capital at Sep. 30, 2013	$ 253.8	$ 19.9	$ 232.9	$ 1.0