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Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]          
Performance obligations satisfied or partially satisfied in previous periods $ 8.3 $ 21.2 $ 14.1 $ 23.7  
Contract asset         $ 1.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01          
Revenue from Contract with Customer [Abstract]          
Unfulfilled performance obligations         $ 2.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Performance obligation expected duration         24 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01          
Revenue from Contract with Customer [Abstract]          
Unfulfilled performance obligations $ 1.7   $ 1.7    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Performance obligation expected duration 24 months   24 months