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Leases - Reconciliation of Future Minimum Undiscounted Payments to Operating Lease Liabilities (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Remainder of 2019 $ 13.5
2020 17.9
2021 17.5
2022 18.2
2023 18.4
2024 and Thereafter 70.2
Total Undiscounted Lease Payments 155.7
Present Value Adjustment (25.4)
Net Operating Lease Liabilities $ 130.3