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

6 Months Ended

Jun. 30, 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):

	June 30, 2014			December 31, 2013
Contract billings	$	702.9		$	606.5
Retainage	140.8			159.3
Costs and earnings in excess of billings	463.2			384.6
Accounts receivable, gross	$	1,306.9		$	1,150.4
Less allowance for doubtful accounts	(18.2		)	(15.7		)
Accounts receivable, net	$	1,288.7		$	1,134.7