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Investments (Tables)
 12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities, Equity Method Investments and Joint Ventures [Abstract]  
Equity Securities 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,
2020		December 31, 2019
Fair value methodPrepaid expenses and other current assets$2.5 $6.6 
Fair value method(1)
Other non-current assets$1.9 $2.3 
Equity methodOther non-current assets$69.8 $17.8 

(1) Measured at fair value using the Net Asset Value practical expedient.
Equity security expense (income) The following table summarizes the expense (income) recognized in earnings of our equity securities (in millions):
Year Ended
Measurement CategoryIncome Statement LocationDecember 31,
2020		December 31,
2019		December 31,
2018
Fair value method
Other (income) expense, net
$3.0 $4.9 $9.5 
Equity method
Other (income) expense, net
$(3.0)$(2.7)$(2.7)