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Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Other Property and Estimated Useful Lives of Property

Estimated useful lives of property are as follows:

Classification			Range of Life (in years)
Building and improvements			10 to 40
Leasehold improvements			5 to 10 (lesser of useful life or lease term)
Water, power and sewer systems			5 to 50
Asphalt plants, machinery and equipment			2 to 35
Other property improvements			3 to 35

Real estate property, net as of December 31, 2020 and 2019 includes the following (in millions):

						2020						2019
Land						$	769.6					$	768.8
Buildings						696.0						692.4
Other property improvements						84.1						79.0
Subtotal						1,549.7						1,540.2
Accumulated depreciation						(154.4)						(127.5)
Real estate property, net						$	1,395.3					$	1,412.7

Other property, net, as of December 31, 2020 and 2019 was as follows (in millions):

						2020						2019
Land						$	39.3					$	38.4
Buildings						18.5						19.7
Asphalt plants, machinery and equipment						104.4						105.5
Water, power and sewer systems						19.7						30.6
Other property improvements						6.4						6.8
Subtotal						188.3						201.0
Accumulated depreciation						(77.5)						(76.6)
Other property, net						$	110.8					$	124.4

Schedule of Interest and Other Income (Expense)

Interest and other income (expense), net for the years ended December 31, 2020, 2019 and 2018 included the following (in millions):

						2020						2019						2018
Pension and postretirement benefit (expense)						$	(2.6)					$	(3.1)					$	(3.0)
Interest income						1.7						3.0						1.5
Gain (loss) on sale of joint venture interest						—						2.6						4.2
Reductions in solar investments, net						—						(0.1)						(0.5)
Other income (expense)						1.2						0.8						0.1
Interest and other income (expense), net						$	0.3					$	3.2					$	2.3

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						4.3						1.6						2.7
Allowance for credit losses on costs and estimated earnings in excess of billings on uncompleted contracts1						0.1						—						0.1
Total						$	6.0					$	1.9					$	4.1

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

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Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.

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