Accounts Receivable, Net of Allowance (Tables)

9 Months Ended

Sep. 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):

	September 30, 2016			December 31, 2015
Contract billings	$	559.3		$	437.3
Retainage	224.9			148.8
Costs and earnings in excess of billings	440.1			332.7
Accounts receivable, gross	$	1,224.3		$	918.8
Less allowance for doubtful accounts	(8.3		)	(7.7		)
Accounts receivable, net	$	1,216.0		$	911.1