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ARO Trust (Tables)

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

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


			September 30, 2023												December 31, 2022
			Amortized Cost Basis						Fair Value						Amortized Cost Basis						Fair Value
Money Market Funds			$	24.3					$	24.3					$	16.4					$	16.4
U.S. Equity Funds			52.6						106.8						52.7						96.1
International Equity Funds			31.7						36.3						31.6						35.2
Municipal Bond Funds			87.7						79.9						87.7						82.0
Total			$	196.3					$	247.3					$	188.4					$	229.7