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Significant Accounting Policies (Tables) | 12 Months Ended
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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 contracts 1 |  | 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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