Income Taxes - Schedule of Tax effects of Temporary Differences Affecting Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Employee benefits	$ 4.4	$ 6.3
Capitalized costs	1.3	1.5
Joint ventures and other investments	6.0	6.0
Impairment and amortization	0.7	24.8
Solar investment benefits	15.2	14.9
Insurance and other reserves	6.0	7.2
Disallowed interest expense	10.5	8.9
Net operating losses	61.0	44.1
Operating lease liability	0.0	6.6
Other	3.9	1.0
Total deferred tax assets	109.0	121.3
Valuation allowance	(109.0)	(109.8)
Total net deferred tax assets	0.0	11.5
Deferred tax liabilities:
Property (including tax-deferred gains on real estate transactions)	0.0	5.0
Operating lease asset	0.0	6.5
Total deferred tax liabilities	0.0	11.5
Net deferred tax assets (liabilities)	$ 0.0	$ 0.0

The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from capitalized development costs, which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

No definition available.