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Commitments, Guarantees and Contingencies - Leasing Agreements (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Leasing Agreements [Line Items]      
Operating Leases, Future Minimum Payments, Current $ 12.1    
Operating Leases, Future Minimum Payments, Due in Two Years 11.5    
Operating Leases, Future Minimum Payments, Due in Three Years 9.5    
Operating Leases, Future Minimum Payments, Due in Four Years 8.7    
Operating Leases, Future Minimum Payments, Due in Five Years 7.4    
Operating Leases, Future Minimum Payments, Due Thereafter 29.2    
Operating Leases, Rent Expense 13.8 11.5 9.4
BNI Dragline [Member]
      
Leasing Agreements [Line Items]      
Termination Fee 3.0    
Operating Leases, Future Minimum Payments, Current $ 2.8