Accounts Receivable, Net of Allowance (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2015			December 31, 2014
Contract billings	$	552.1		$	669.7
Retainage	152.6			162.2
Costs and earnings in excess of billings	436.3			485.6
Accounts receivable, gross	$	1,141.0		$	1,317.5
Less allowance for doubtful accounts	(8.2		)	(13.9		)
Accounts receivable, net	$	1,132.8		$	1,303.6