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Fair Value Measurements (Notes)
3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following table presents, by level within the fair value hierarchy, certain of our significant financial assets and liabilities. The carrying values of short-term financial assets that have variable interest rates (advances to affiliate), accounts receivable and accounts payable approximate fair value because of the short-term nature of these instruments. Therefore, these assets and liabilities are not presented in the following table.
 
Fair Value Measurements Using
Carrying
Amount
Fair ValueQuoted
Prices In
Active
Markets for
Identical
Assets
(Level  1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
(Millions)
Assets (liabilities) at March 31, 2023:
Measured on a recurring basis:
ARO Trust investments$242.3 $242.3 $242.3 $— $— 
Additional disclosures:
Long-term debt, including current portion(5,278.0)(5,423.3)— (5,423.3)— 
Assets (liabilities) at December 31, 2022:
Measured on a recurring basis:
ARO Trust investments$229.7 $229.7 $229.7 $— $— 
Additional disclosures:
Long-term debt, including current portion(5,280.3)(5,361.7)— (5,361.7)— 

Fair Value Methods

The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:

ARO Trust investments: We deposit a portion of our collected rates, pursuant to the terms of the Docket No. RP18-1126 rate case settlement, into the ARO Trust, which is specifically designated to fund future AROs. The ARO Trust invests in a portfolio of actively traded mutual funds that are measured at fair value on a recurring basis based on quoted prices in an active market and are reported in Other Assets - Other on the Balance Sheet. However, both realized and unrealized gains and losses are ultimately recorded as regulatory assets or liabilities. See Note 5 – ARO Trust for more information.

Long-term debt, including current portion: The disclosed fair value of our long-term debt is determined primarily by a market approach using broker quoted indicative period-end bond prices. The quoted prices are based on observable transactions in less active markets for our debt or similar instruments. The fair value of the financing obligations associated with our Dalton, Atlantic Sunrise and Leidy South projects were determined using an income approach (see Note 4 – Debt and Financing Arrangements).