XML 24 R15.htm IDEA: XBRL DOCUMENT

ARO Trust (Tables)

9 Months Ended

Sep. 30, 2022

Investments, Debt and Equity Securities [Abstract]

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


			September 30, 2022												December 31, 2021
			Amortized Cost Basis						Fair Value						Amortized Cost Basis						Fair Value
Money Market Funds			$	15.3					$	15.3					$	5.9					$	5.9
U.S. Equity Funds			52.6						90.1						52.7						121.4
International Equity Funds			31.7						31.0						31.7						43.2
Municipal Bond Funds			87.7						79.8						87.7						90.0
Total			$	187.3					$	216.2					$	178.0					$	260.5