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Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Contract assets - current | $ 47.0 |  | $ 47.0 |  | $ 38.4
Contract assets - long-term | 21.3 |  | 21.3 |  | 21.6
Deferred revenue - current | (197.4) |  | (197.4) |  | (246.4)
Deferred revenue - long-term | (122.5) |  | (122.5) |  | $ (147.0)
Revenue recognized that was included in deferred revenue at the beginning of the period | $ 48.1 | $ 30.1 | $ 197.3 | $ 202.1 |

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