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Revenues, Unbilled Revenue and Deferred Revenue (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Contracts with Customers, Assets and Liabilities [Abstract] |  |  |  |
Unbilled revenue | $ 15.0 | $ 18.8 | $ 17.6 | $ 13.3
Deferred revenue | 445.6 | 343.5 | $ 314.9 | $ 291.2
Prepaid and other current assets [Member] |  |  |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |  |  |
Unbilled revenue (current amount) | 15.0 | 18.8 |  |
Other current liabilities [Member] |  |  |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |  |  |
Deferred revenue (current amount) | 196.1 | 145.3 |  |
Other long-term liabilities [Member] |  |  |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |  |  |
Deferred revenue (noncurrent) | $ 249.5 | $ 198.2 |  |

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