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v3.19.3

Revenues, Unbilled Revenue and Deferred Revenue (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Contracts with Customers, Assets and Liabilities [Abstract] |  |
Unbilled revenue | $ 223.8 | $ 13.3
Deferred revenue | 329.6 | $ 291.2
Other Current Assets [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Unbilled revenue (current amount) | 223.8 |
Other Current Liabilities [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Deferred revenue (current amount) | 137.4 |
Other Liabilities [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Deferred revenue (noncurrent) | $ 192.2 |

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