Accounts Receivable, Net of Allowance (Tables)

3 Months Ended

Mar. 31, 2013

Receivables [Abstract]

Schedule Of Accounts Receivable, Net of Allowance

The following table, which may contain summation differences due to rounding, provides details of accounts receivable, net of allowance, which is classified as current (in millions).

	March 31, 2013			December 31, 2012
Contract billings	$	468.4		$	522.1
Retainage	111.0			113.5
Costs and earnings in excess of billings	337.8			252.8
Accounts receivable, gross	$	917.2		$	888.3
Less allowance for doubtful accounts	(14.7		)	(11.2		)
Accounts receivable, net	$	902.4		$	877.1