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Leases - Reconciliation of Future Minimum Undiscounted Payments to Operating Lease Liabilities (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Leases [Abstract]  
2020 $ 17.9
2021 17.5
2022 18.3
2023 18.5
2024 17.8
2025 and Thereafter 53.1
Total Undiscounted Lease Payments 143.1
Present Value Adjustment (22.0)
Net Operating Lease Liabilities $ 121.1