Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Schedule of Accounts Receivable, Net of Allowance, and Contract Assets

The following table provides details of accounts receivable, net of allowance, and contract assets (together “accounts receivable, net”) as of the dates indicated (in millions):

	December 31,
	2020		2019
Contract billings	$	805.0	$	860.4
Less allowance	(20.5)		(10.1)
Accounts receivable, net of allowance	$	784.5	$	850.3
Retainage	$	287.7	$	345.2
Unbilled receivables	682.0		679.4
Contract assets	$	969.7	$	1,024.6