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Cash and Marketable Securities - Scheduled Maturities of Investments in Debt Securities (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Cost  
Due in one year or less $ 12.6
Due after one year through five years 0.0
Due after five years through ten years 0.0
Due after ten years 0.0
Total 12.6
Fair Value  
Due in one year or less 12.6
Due after one year through five years 0.0
Due after five years through ten years 0.0
Due after ten years 0.0
Total $ 12.6