Accounts Receivable, Net of Allowance (Tables)

9 Months Ended

Sep. 30, 2015

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, 2015			December 31, 2014
Contract billings	$	512.3		$	669.7
Retainage	164.0			162.2
Costs and earnings in excess of billings	356.0			485.6
Accounts receivable, gross	$	1,032.3		$	1,317.5
Less allowance for doubtful accounts	(8.6		)	(13.9		)
Accounts receivable, net	$	1,023.7		$	1,303.6