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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other long-term liabilities |  |
Revenue Recognition |  |
Deferred revenue | $ 135.0 | $ 321.0
Accrued liabilities |  |
Revenue Recognition |  |
Deferred revenue | 218.4 | 255.6
Other current assets |  |
Revenue Recognition |  |
Deferred expenses | 61.2 | 63.4
Other long term assets |  |
Revenue Recognition |  |
Deferred expenses | $ 32.6 | $ 69.5

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