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Revenue - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]    
Revenue, remaining performance obligation, amount $ 60.7  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, percentage 49.00%  
Expected timing of satisfaction   1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue, remaining performance obligation, percentage 21.00%  
Expected timing of satisfaction   1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Expected timing of satisfaction