Accounts Receivable, Net of Allowance (Tables)

6 Months Ended

Jun. 30, 2017

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, 2017			December 31, 2016
Contract billings	$	784.5		$	564.2
Retainage	228.6			268.6
Costs and earnings in excess of billings	565.1			331.6
Accounts receivable, gross	$	1,578.2		$	1,164.4
Less allowance for doubtful accounts	(8.8		)	(8.4		)
Accounts receivable, net	$	1,569.4		$	1,156.0