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Leases - Future minimum rental obligations under non-cancelable operating leases (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Future minimum rental obligations under non-cancelable operating leases  
2019 $ 14.1
2020 11.8
2021 10.2
2022 7.5
2023 4.3
Thereafter 15.8
Total $ 63.7