Accounts Receivable, Net of Allowance (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2016			December 31, 2015
Contract billings	$	478.9		$	437.3
Retainage	145.5			148.8
Costs and earnings in excess of billings	354.0			332.7
Accounts receivable, gross	$	978.4		$	918.8
Less allowance for doubtful accounts	(7.5		)	(7.7		)
Accounts receivable, net	$	970.9		$	911.1