Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

Name:	invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

Derivative Financial Instruments (Details) In Millions, unless otherwise specified	Jun. 30, 2013 Futures contracts Long bbl	Jun. 30, 2013 Futures contracts Short bbl	Jun. 30, 2013 Natural Gas Contracts Long decatherm	Jun. 30, 2013 Natural Gas Contracts Short decatherm	Jun. 30, 2013 Interest Rate collar USD ($)	Jun. 30, 2013 Interest rate swap USD ($)	Jun. 30, 2013 Interest rate cap USD ($)	Jun. 30, 2013 Open forward exchange contracts USD ($)	Jun. 30, 2013 Open forward exchange contracts CAD
Volume of activity related to derivative financial instruments
Nonmonetary units	10,673,000	(13,471,000)	6,643,000	(6,643,000)
Monetary units					$ 100.0	$ 100.0	$ 100.0	$ 19.2	20.2
Forward rate of CAD to USD								1.0521	1.0521