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Intangible Assets - Intangibles (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Intangible assets    
Less: accumulated amortization $ (2.5) $ (2.1)
Intangible assets, net 8.9 9.3
Customer relationships    
Intangible assets    
Intangible assets, gross $ 11.4 $ 11.4
Minimum | Customer relationships    
Intangible assets    
Estimated Useful Life (years) 10 years  
Maximum | Customer relationships    
Intangible assets    
Estimated Useful Life (years) 18 years