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Revenues, Unbilled Revenue and Deferred Revenue (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Contracts with Customers, Assets and Liabilities [Abstract] |  |
Unbilled revenue | $ 151.5 | $ 17.6
Deferred revenue | 349.8 | $ 314.9
Other Current Assets [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Unbilled revenue (current amount) | 151.5 |
Other Current Liabilities [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Deferred revenue (current amount) | 136.0 |
Other Liabilities [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Deferred revenue (noncurrent) | $ 213.8 |

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