Annual report pursuant to Section 13 and 15(d)

Commitments - Purchase Obligations (Details)

v2.4.0.6
Commitments - Purchase Obligations (Details) (Exploration and Capital Expenditures Commitments, USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Exploration and Capital Expenditures Commitments
 
Purchase Commitment, Excluding Long-term Commitment [Line Items]  
Firm Commitments $ 5.4