CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL (USD $) In Millions, unless otherwise specified	Total	General Partner's Interest	Common Units	Class B Common Units
Partners' capital balance at Dec. 31, 2010	$ 210.0	$ 0.9	$ 208.5	$ 0.6
Increase (Decrease) in Partners' Capital
Net earnings	120.9	53.2	66.6	1.1
Distributions	(33.7)	(8.3)	(25.1)	(0.3)
Partners' capital balance at Mar. 31, 2011	297.2	45.8	250.0	1.4
Partners' capital balance at Dec. 31, 2011	269.3	33.4	234.8	1.1
Increase (Decrease) in Partners' Capital
Net earnings	124.2	53.1	69.9	1.2
Distributions	(151.2)	(65.9)	(83.9)	(1.4)
Partners' capital balance at Mar. 31, 2012	$ 242.3	$ 20.6	$ 220.8	$ 0.9