Accounts Receivable, Net of Allowance (Tables)

6 Months Ended

Jun. 30, 2015

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, 2015			December 31, 2014
Contract billings	$	585.3		$	669.7
Retainage	159.2			162.2
Costs and earnings in excess of billings	390.4			485.6
Accounts receivable, gross	$	1,134.9		$	1,317.5
Less allowance for doubtful accounts	(8.0		)	(13.9		)
Accounts receivable, net	$	1,126.9		$	1,303.6