Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 86.9	$ 149.4
Demand deposits with affiliates of the General Partner		5.4
Due from affiliates of the General Partner	29.0
Accounts receivable	1.0	0.6
Inventories	5.9	5.8
Prepaid expenses and other current assets	7.8	1.6
Total current assets	130.6	162.8
Property, plant and equipment, net	214.1	128.1
Other assets	5.1	7.7
Total assets	349.8	298.6
Current liabilities:
Accounts payable and accrued expenses	27.9	24.3
Due to affiliates of the General Partner	3.7
Other current liabilities	8.0	1.0
Total current liabilities	39.6	25.3
Noncurrent liabilities	1.2	1.5
Partners' capital:
General partner's interest	43.0	32.3
Total partners' capital	309.0	271.8
Total liabilities and partners' capital	349.8	298.6
Common
Partners' capital:
Limited partners' interests	264.5	238.3
Class B Common
Partners' capital:
Limited partners' interests	$ 1.5	$ 1.2