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Accounts Receivable, net
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Accounts Receivable, net
Accounts Receivable, net
Accounts receivable, net consists of the following:
 
December 31,
2013
 
December 31,
2012
Trade receivables(1)(2)(3)
$
544.2

 
$
415.9

Other
6.8

 
9.1

Less: allowance for doubtful accounts
(0.2
)
 
(4.3
)
Accounts receivable, net
$
550.8

 
$
420.7

_______________________________________

(1)
Includes unbilled receivables of $33.5 and $25.6 at December 31, 2013 and December 31, 2012, respectively.
(2)
Includes $135.1 and $102.0 held in retainage at December 31, 2013 and December 31, 2012, respectively.
(3)
Includes $24.6 of withheld payments by a customer pending completion of retrofit work.
Accounts receivable, net includes unbilled receivables on long-term aerospace contracts, comprised principally of revenue recognized on contracts for which amounts were earned but not contractually billable as of the balance sheet date, or amounts earned in which the recovery will occur over the term of the contract, which could exceed one year.
Also included in accounts receivable are amounts held in retainage which, as of December 31, 2013, are all related to Gulfstream and represent amounts due on G650 deliveries from 2010 through the third quarter of 2013. As described in more detail in Note 22, "Commitments, Contingencies and Guarantees," in August 2013, the Company instituted a demand for arbitration against Gulfstream Aerospace Corporation, seeking damages from Gulfstream for its incomplete payments to Spirit, as well as other damages and relief. Gulfstream counterclaimed against Spirit in the arbitration, seeking liquidated damages for delayed deliveries of wings, as well as other damages and relief.  While we believe that the short-paid amount is collectible, if we are unable to collect this amount or if it becomes part of an overall settlement or arbitration award, recognition of additional forward losses on the G650 program could be required and the future cash flows of the Company could be significantly impacted.
On May 3, 2012, one of our customers, Hawker Beechcraft, filed for bankruptcy protection under Chapter 11 of the United States Bankruptcy Code. Subsequent to the bankruptcy filing, the Company reserved the remaining balance of its $3.5 receivable from Hawker in 2012. This balance was written off in 2013.