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ARO Trust (Tables)

6 Months Ended

Jun. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Investments within the ARO Trust were as follows (in millions):


			June 30, 2023												December 31, 2022
			Amortized Cost Basis						Fair Value						Amortized Cost Basis						Fair Value
Money Market Funds			$	22.8					$	22.8					$	16.4					$	16.4
U.S. Equity Funds			52.6						110.8						52.7						96.1
International Equity Funds			31.7						38.0						31.6						35.2
Municipal Bond Funds			87.7						82.8						87.7						82.0
Total			$	194.8					$	254.4					$	188.4					$	229.7