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Leases Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Leases [Abstract] |  |
2019 (remaining six months) | $ 6.6 |
2020 | 12.0 |
2021 | 10.2 |
2022 | 8.4 |
2023 | 7.8 |
Thereafter | 48.9 |
Operating leases liabilities payments due | 93.9 |
Less: imputed lease interest | 17.3 |
Total lease liabilities | $ 76.6 |
2019 |  | $ 13.0
2020 |  | 10.5
2021 |  | 7.8
2022 |  | 6.9
2023 |  | 5.5
Thereafter |  | 37.8
Total |  | $ 81.5

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