CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 290.6	$ 149.4
Demand deposits with affiliates of the General Partner		5.4
Due from affiliates of the General Partner	5.1
Accounts receivable	0.7	0.6
Inventories, net	5.1	5.8
Prepaid expenses and other current assets	3.3	1.6
Total current assets	304.8	162.8
Property, plant and equipment, net	141.3	128.1
Other assets	8.0	7.7
Total assets	454.1	298.6
Current liabilities:
Accounts payable and accrued expenses	21.8	24.3
Due to affiliates of the General Partner	110.1
Other current liabilities		1.0
Total current liabilities	131.9	25.3
Noncurrent liabilities	1.6	1.5
Partners' capital:
General partner's interest	55.8	32.3
Total partners' capital	320.6	271.8
Total liabilities and partners' capital	454.1	298.6
Common
Partners' capital:
Limited partners' interests	263.2	238.3
Class B Common
Partners' capital:
Limited partners' interests	$ 1.6	$ 1.2