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Revenues - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Revenue Receivable from Contract with Customer |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Accounts receivable, gross | $ 31.8 | $ 35.3 | $ 42.6

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