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

9 Months Ended

Sep. 30, 2014

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):

	September 30, 2014			December 31, 2013
Contract billings	$	775.6		$	606.5
Retainage	179.3			159.3
Costs and earnings in excess of billings	451.7			384.6
Accounts receivable, gross	$	1,406.6		$	1,150.4
Less allowance for doubtful accounts	(16.7		)	(15.7		)
Accounts receivable, net	$	1,389.9		$	1,134.7