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Investments - Available For Sale Short Term Investments by Major Security Type (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Cost Total $ 1.7
Fair Value Total 1.7
Less than 1 year 0.5
1 to 5 years 1.2
Term deposits  
Debt Securities, Available-for-sale [Line Items]  
Cost Total 1.7
Fair Value Total 1.7
Less than 1 year 0.5
1 to 5 years $ 1.2