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Employee benefit plans and compensation plans - Defined benefit plans - Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]    
Employer benefit payments/settlements $ 0.3 $ 0.4
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]    
2020 0.5  
2021 0.4  
2022 0.4  
2023 0.4  
2024 0.5  
2024 -2028 3.1  
Total benefit payments required $ 5.3