Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

Impact of ASC 326

The following table illustrates the impact of the Company's adoption of ASC 326 (in millions):

	January 1, 2020
	As Reported under ASC 326		Prior to ASC 326 Adoption		Impact of ASC 326 Adoption
Assets:
Allowance for credit losses on Accounts receivable and retention	$	1.6	$	0.3	$	1.3
Allowance for credit losses on Other receivables	4.2		1.6		2.6
Allowance for credit losses on costs and estimated earnings in excess of billings on uncompleted contracts1	0.1		—		0.1
Total	$	5.9	$	1.9	$	4.0

1 Included in Prepaid expenses and other assets in the condensed consolidated balance sheets.

Interest and Other Income (Expense), Net

Interest and other income (expense), net for the three and nine months ended September 30, 2020 and 2019 included the following (in millions):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Interest income	$	0.2	$	0.9	$	1.0	$	2.9
Pension and postretirement benefit (expense)	(0.6)		(1.1)		(1.9)		(3.4)
Gain (loss) on sale of joint venture interest	—		—		—		2.6
Other income (expense), net	—		0.8		0.3		0.7
Interest and other income (expense), net	$	(0.4)	$	0.6	$	(0.6)	$	2.8