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Fair Value Measurements
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements FAIR VALUE
Fair value is the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value of assets and liabilities, the following hierarchy is used in selecting inputs, with the highest priority given to Level 1, as these are the most transparent or reliable:
Level 1 – quoted prices for identical instruments in active markets.
Level 2 – quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs are observable in active markets.
Level 3 – valuations derived using one or more significant inputs that are not observable.

Financial Instruments Recorded at Fair Value (in millions):
December 31, 2020December 31, 2019
 Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Assets:        
Cash and cash equivalents$152.0 $— $— $152.0 $130.7 $— $— $130.7 
Deferred compensation asset (a)2.4 — — 2.4 1.8 — — 1.8 
Liabilities:        
Deferred compensation obligation (a)
$2.3 $— $— $2.3 $1.8 $— $— $1.8 
 
(a)    The deferred compensation obligation represents the balance of deferred compensation plus net investment earnings. The deferred compensation plan is funded through a rabbi trust. Trust funds are invested in mutual funds for which unit prices are quoted in active markets and are classified within Level 1 of the valuation hierarchy.

There were no transfers between Level 1, 2 or 3 during the periods presented.

Other Financial Instruments

As of December 31, 2020 and 2019, the balance sheet carrying amounts for Accounts Receivable, Accounts Payable and Accrued Liabilities (excluding the deferred compensation obligation described above), and Payables under SWU Purchase Agreements approximate fair value because of their short-term nature.

The carrying value and estimated fair value of long-term debt are as follows (in millions):
December 31, 2020December 31, 2019
Carrying Value
Estimated Fair Value (a)
Carrying Value
Estimated Fair Value (a)
8.25% Notes$114.1 
(b)
$68.6 $120.2 
(b)
$61.5 
(a) Based on recent trading prices and bid/ask quotes as of or near the balance sheet date, which are considered Level 2 inputs based on the frequency of trading.
(b)    The carrying value of the 8.25% Notes consists of the principal balance of $74.3 million and the sum of current and noncurrent interest payment obligations until maturity. Refer to Note 9, Debt.