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Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Carrying amount of short-term investments $ 55.4  
Fair Value of Short Term investments 55.1  
Carrying amount of long-term debt 130.0 $ 181.0
Fair value of long-term debt $ 139.0 $ 200.0