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ARO Trust (Tables)

6 Months Ended

Jun. 30, 2022

Investments, Debt and Equity Securities [Abstract]

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


			June 30, 2022												December 31, 2021
			Amortized Cost Basis						Fair Value						Amortized Cost Basis						Fair Value
Money Market Funds			$	13.9					$	13.9					$	5.9					$	5.9
U.S. Equity Funds			52.6						94.7						52.7						121.4
International Equity Funds			31.7						34.9						31.7						43.2
Municipal Bond Funds			87.7						82.5						87.7						90.0
Total			$	185.9					$	226.0					$	178.0					$	260.5