CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 70.5	$ 149.4
Demand deposits with affiliates of the General Partner		5.4
Due from affiliates of the General Partner	19.9
Accounts receivable	1.2	0.6
Inventories	5.0	5.8
Prepaid expenses and other current assets		1.6
Total current assets	96.6	162.8
Property, plant and equipment, net	199.0	128.1
Other assets	7.3	7.7
Total assets	302.9	298.6
Current liabilities:
Accounts payable and accrued expenses	40.8	24.3
Due to affiliates of the General Partner	5.3
Other current liabilities	1.5	1.0
Total current liabilities	47.6	25.3
Noncurrent liabilities	1.5	1.5
Partners' capital:
General partner's interest	19.9	32.3
Total partners' capital	253.8	271.8
Total liabilities and partners' capital	302.9	298.6
Common
Partners' capital:
Limited partners' interests	232.9	238.3
Class B Common
Partners' capital:
Limited partners' interests	$ 1.0	$ 1.2