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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of Investments measured at Fair Value

The following tables present investments measured at fair value:

 

   June 30, 2023 
(In millions)  Level 1   Level 2   Level 3   Total 
Assets:                    
Marketable securities  $0.3   $   $   $0.3 

 

   December 31, 2022 
(In millions)  Level 1   Level 2   Level 3   Total 
Assets:                
Marketable securities  $   $   $   $