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Revenues, Unbilled Revenue and Deferred Revenue (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Contracts with Customers, Assets and Liabilities [Abstract] |  |
Unbilled revenue | $ 64.6 | $ 0.0
Deferred revenue | 219.1 | $ 224.7
Other Current Assets [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Unbilled revenue (current amount) | 64.4 |
Other Assets [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Unbilled revenue (noncurrent) | 0.2 |
Other Current Liabilities [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Deferred revenue (current amount) | 78.5 |
Other Liabilities [Member] |  |
Contracts with Customers, Assets and Liabilities [Abstract] |  |
Deferred revenue (noncurrent) | $ 140.6 |

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