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v3.21.1

Revenues, Unbilled Revenue and Deferred Revenue (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Contracts with Customers, Assets and Liabilities [Abstract] |  |
Unbilled revenue | $ 66.5 | $ 18.8
Deferred revenue | 365.4 | $ 343.5
Other Current Assets [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Unbilled revenue (current amount) | 66.5 |
Other Current Liabilities [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Deferred revenue (current amount) | 148.7 |
Other Liabilities [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Deferred revenue (noncurrent) | $ 216.7 |

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