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Income Taxes - Schedule of Tax effects of Temporary Differences Affecting Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Employee benefits | $ 11.5 | $ 10.4
Capitalized costs | 5.5 | 6.2
Joint ventures and other investments | 42.6 | 49.1
Impairment and amortization | 1.6 | 0.9
Solar investment benefits | 15.7 | 16.7
Insurance and other reserves | 6.4 | 3.2
Disallowed interest expense | 9.1 | 8.4
Net operating losses | 20.5 | 17.6
Operating lease liability | 2.0 | 2.6
Other | 3.2 | 3.4
Total deferred tax assets | 118.1 | 118.5
Valuation allowance | (104.0) | (99.3)
Total net deferred tax assets | 14.1 | 19.2
Deferred tax liabilities: |  |
Property (including tax-deferred gains on real estate transactions) | 12.2 | 16.0
Operating lease asset | 1.9 | 2.5
Other | 0.0 | 0.7
Total deferred tax liabilities | 14.1 | 19.2
Net deferred tax assets (liabilities) | $ 0.0 | $ 0.0

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