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Investments
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities, Equity Method Investments and Joint Ventures [Abstract]  
Investments INVESTMENTS
The following table summarizes the measurement category, balance sheet location, and balances of our equity securities (in millions):
Year Ended
Measurement CategoryBalance Sheet LocationDecember 31, 2023December 31, 2022
Fair value methodPrepaid expenses and other current assets$0.1 $0.1 
Fair value method(1)
Other non-current assets$1.3 $1.7 
Equity methodOther non-current assets$60.1 $63.4 
(1) Measured at fair value using the Net Asset Value practical expedient.

The following table summarizes the expense (income) recognized in earnings of our equity securities (in millions):

Year Ended
Measurement CategoryIncome Statement LocationDecember 31, 2023December 31, 2022December 31, 2021
Fair value methodOther (income) expense, net$0.4 $0.4 $2.0 
Equity methodOther (income) expense, net$1.9 $1.5 $1.1