Accounts Receivable, Net of Allowance (Tables)

6 Months Ended

Jun. 30, 2016

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, 2016			December 31, 2015
Contract billings	$	526.8		$	437.3
Retainage	175.6			148.8
Costs and earnings in excess of billings	398.2			332.7
Accounts receivable, gross	$	1,100.6		$	918.8
Less allowance for doubtful accounts	(9.6		)	(7.7		)
Accounts receivable, net	$	1,091.0		$	911.1