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Supplemental Cash Flow Information (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 Units | Dec. 31, 2009 | Nov. 30, 2010 | Nov. 04, 2010 | Nov. 30, 2009 | Jun. 30, 2009
Supplemental Cash Flow Information (Textual) [Abstract] |  |  |  |  |  |  |
Cash interest paid on long term-debt, advances from affiliates and capital lease obligations | $ 154.3 | $ 135.5 | $ 105.0 |  |  |  |
Termination fee | 22.6 |  |  |  |  |  |
Income Taxes Paid | 1.5 | 0.2 | 0.2 |  |  |  |
Net Investments in Direct Financing Leases |  |  | 425.9 |  |  |  |
Interest rate Swap, Notional Amount |  |  |  |  |  | 30.0 | 30.0
Acquisition of Interest Rate Swaps |  | 1.5 | 4.8 |  |  |  |
Purchase price of joint ventures by partnership through issuance of common units |  |  |  |  | $ 37.3 |  |
Percentage of ownership in joint venture |  |  |  | 50.00% |  |  |
Issuance of common units |  | 1,100,000 |  |  |  |  |

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