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Leases - Future Minimum Lease Payments (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]  
2019 (excluding the six months ending June 30, 2019) $ 19.4
2020 34.9
2021 24.4
2022 21.0
2023 16.6
Thereafter 131.0
Total undiscounted lease payments 247.3
Less: Present value adjustment (51.3)
Present value of lease liabilities $ 196.0