XML 35 R26.htm IDEA: XBRL DOCUMENT

ARO Trust (Tables)

12 Months Ended

Dec. 31, 2021

Investments, Debt and Equity Securities [Abstract]

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


						December 31, 2021												December 31, 2020
						Amortized Cost Basis						Fair Value						Amortized Cost Basis						Fair Value
Money Market Funds						$	5.9					$	5.9					$	5.8					$	5.8
U.S. Equity Funds						52.7						121.4						59.9						108.0
International Equity Funds						31.7						43.2						34.2						43.7
Municipal Bond Funds						87.7						90.0						74.9						78.0
Total						$	178.0					$	260.5					$	174.8					$	235.5