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ARO Trust (Tables)

12 Months Ended

Dec. 31, 2020

Investments, Debt and Equity Securities [Abstract]

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


						December 31, 2020												December 31, 2019
						Amortized Cost Basis						Fair Value						Amortized Cost Basis						Fair Value
Money Market Funds						$	5.8					$	5.8					$	15.8					$	15.8
U.S. Equity Funds						59.9						108.0						55.3						83.3
International Equity Funds						34.2						43.7						31.8						35.4
Municipal Bond Funds						74.9						78.0						64.7						66.1
Total						$	174.8					$	235.5					$	167.6					$	200.6