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Leases - Summary of Maturities of Operating Lease Liabilities (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Leases [Abstract]  
2019 $ 6.6
2020 11.4
2021 9.7
2022 7.3
2023 4.5
Thereafter 16.1
Total lease payments 55.6
Less: imputed interest (7.0)
Present value of lease liabilities $ 48.6