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Revenue - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Monthly resident fees | $ 45.8 | $ 45.8 | $ 49.7
Revenue recognized |  | 76.2 |
Additions for allowance for doubtful accounts | 4.5 | 13.4 |
Deferred Revenue and Credits |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deferred revenue | $ 103.6 | $ 103.6 | $ 112.4

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