Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Derivative Instrument

Net liabilities measured at fair value on a recurring basis are summarized below (in millions):

	March 31, 2015 Level 2		December 31, 2014 Level 2
Commodity Swaps*	$	17.4	$	21.7
Total	$	17.4	$	21.7

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* The fair value of derivative contracts included in assets or liabilities for risk management activities represents the amount at which the instruments could be exchanged in a current arms-length transaction adjusted for credit risk of the Partnership and/or the counterparty as required under FASB ASC 820.

Fair Value Financial Instrument

Considerable judgment is required to develop the estimates of fair value; thus, the estimates provided below are not necessarily indicative of the amount the Partnership could realize upon the sale or refinancing of such financial instruments (in millions):

	March 31, 2015				December 31, 2014
	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt	$	2,493.7	$	2,571.2	$	2,022.5	$	2,026.1
Obligations under capital leases	$	19.3	$	18.7	$	20.3	$	19.8