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Disaggregation of Revenue - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Monthly resident fees | $ 50.6 | $ 49.7
Revenue recognized | 82.1 |
Additions for allowance for doubtful accounts | 17.6 |
Deferred Revenue and Credits |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue | $ 106.4 | $ 112.4

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