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Fair Value Measurements - Assets and Liabilities Recurring and Non-recurring (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value Measurements    
Estimated fair value of feign currency derivative $ 5.4  
Recurring basis    
Fair Value Measurements    
Assets 0.0 $ 0.0
Liabilities 0.0 0.0
Non-recurring basis    
Fair Value Measurements    
Assets 0.0 0.0
Liabilities $ 0.0 $ 0.0