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Summary of Significant Accounting Policies - Maturities of Lease Liabilities, Topic 840 (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Finance Leases |
2019 | $ 1.6
2020 | 1.6
2021 | 1.6
2022 | 1.0
2023 | 0.0
Thereafter | 0.0
Total | 5.8
Operating Leases |
2019 | 48.5
2020 | 42.1
2021 | 30.0
2022 | 20.8
2023 | 14.3
Thereafter | 24.4
Total | 180.1
Minimum sublease rentals due in the future under noncancelable operating leases | $ 2.7

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