Accounts Receivable, Net of Allowance (Tables)

9 Months Ended

Sep. 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):

	September 30, 2017			December 31, 2016
Contract billings	$	626.7		$	564.2
Retainage	287.6			268.6
Costs and earnings in excess of billings	629.5			331.6
Accounts receivable, gross	$	1,543.8		$	1,164.4
Less allowance for doubtful accounts	(9.0		)	(8.4		)
Accounts receivable, net	$	1,534.8		$	1,156.0