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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Other long-term liabilities |  |
Revenue Recognition |  |
Deferred revenue | $ 321.0 | $ 324.3
Accrued liabilities |  |
Revenue Recognition |  |
Deferred revenue | 255.6 | 340.5
Other current assets |  |
Revenue Recognition |  |
Deferred expenses | 63.4 | 79.6
Other long term assets |  |
Revenue Recognition |  |
Deferred expenses | $ 69.5 | $ 68.9

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