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Accounts Receivable, Net of Allowance (Tables)
 12 Months Ended
Dec. 31, 2013
Receivables [Abstract]  
Schedule of Accounts Receivable, Net of Allowance
The following table provides details of accounts receivable, net of allowance, for our continuing operations as of the dates indicated (in millions):
 
December 31,
 
2013
 
2012
Contract billings
$
606.5

 
$
522.0

Retainage
159.3

 
113.5

Costs and earnings in excess of billings
384.6

 
253.0

Accounts receivable, gross
$
1,150.4

 
$
888.5

Less allowance for doubtful accounts
(16.1
)
 
(11.3
)
Accounts receivable, net
$
1,134.3

 
$
877.2
Schedule of Activity in Allowance for Doubtful Accounts
Activity in the allowance for doubtful accounts for our continuing operations business for the periods indicated is as follows (in millions):
 
Years Ended December 31,
 
2013
 
2012
Allowance for doubtful accounts at beginning of year
$
11.3

 
$
7.7

Provision for doubtful accounts
6.1

 
6.9

Amounts charged against the allowance
(1.3
)
 
(3.3
)
Allowance for doubtful accounts at end of year
$
16.1

 
$
11.3