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ARO Trust (Tables)

3 Months Ended

Mar. 31, 2023

Investments, Debt and Equity Securities [Abstract]

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


			March 31, 2023												December 31, 2022
			Amortized Cost Basis						Fair Value						Amortized Cost Basis						Fair Value
Money Market Funds			$	18.9					$	18.9					$	16.4					$	16.4
U.S. Equity Funds			52.6						102.6						52.7						96.1
International Equity Funds			31.7						37.4						31.6						35.2
Municipal Bond Funds			87.7						83.4						87.7						82.0
Total			$	190.9					$	242.3					$	188.4					$	229.7