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Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |  |  |
Contract assets - current | $ 30.3 |  | $ 29.7
Contract assets - long-term | 21.9 |  | 22.2
Deferred revenue - current | (292.2) |  | (294.4)
Deferred revenue - long-term | (158.1) |  | (157.2)
Deposit liabilities principally included in current deferred revenue | 16.5 |  | $ 21.2
Revenue recognized, previously included in deferred revenue | $ 104.9 | $ 104.6 |

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