Accounts Receivable, Net of Allowance (Tables) (Trade Accounts Receivable [Member])

3 Months Ended

Mar. 31, 2014

Trade Accounts Receivable [Member]

Schedule of Accounts Receivable, Net of Allowance [Line Items]

Schedule Of Accounts Receivable, Net of Allowance

The following table provides details of accounts receivable, net of allowance, as of the dates indicated (in millions):

	March 31, 2014			December 31, 2013
Contract billings	$	627.1		$	606.5
Retainage	135.6			159.3
Costs and earnings in excess of billings	448.6			384.6
Accounts receivable, gross	$	1,211.3		$	1,150.4
Less allowance for doubtful accounts	(15.7		)	(15.8		)
Accounts receivable, net	$	1,195.6		$	1,134.6