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Commitments, Guarantees and Contingencies - Leasing Agreements (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Leasing Agreements [Line Items]      
Operating Leases, Future Minimum Payments Due, Current $ 10.9    
Operating Leases, Future Minimum Payments, Due in Two Years 11.1    
Operating Leases, Future Minimum Payments, Due in Three Years 11.4    
Operating Leases, Future Minimum Payments, Due in Four Years 11.2    
Operating Leases, Future Minimum Payments, Due in Five Years 9.2    
Operating Leases, Future Minimum Payments, Due Thereafter 43.0    
Operating Leases, Rent Expense 9.4 9.4 9.3
Exploration and Production Equipment [Member]
      
Leasing Agreements [Line Items]      
Annual Lease Payment 2.8    
Leasing Agreement Expiration Date 2027    
Termination Fee $ 3