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Leases - Operating lease liability maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
2019 (excluding the first quarter of 2019) $ 2.1  
2020 3.9  
2021 3.1  
2022 2.1  
2023 1.5  
2024 1.2  
Thereafter 9.7  
Total lease payments 23.6  
Less imputed interest (7.2)  
Total $ 16.4 $ 18.4