Financial Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping [Table Text Block]

The carrying amount and estimated fair values of the Partnership's financial instruments assets and liabilities which are not recorded at fair value on the Condensed Consolidated Balance Sheets as of March 31, 2013, and December 31, 2012, were as follows (in millions):

As of March 31, 2013			Estimated Fair Value
Financial Assets	Carrying Amount		Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	4.3	$	4.3	$	—	$	—	$	4.3
Financial Liabilities
Long-term debt	$	3,607.7	$	—	$	3,921.3	$	—	$	3,921.3

As of December 31, 2012			Estimated Fair Value
Financial Assets	Carrying Amount		Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	3.9	$	3.9	$	—	$	—	$	3.9
Financial Liabilities
Long-term debt	$	3,539.2	$	—	$	3,841.1	$	—	$	3,841.1