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Revenue (Narrative) (Details) - Loyalty program [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Revenue |  |  |  |  |
Deferred revenue | $ 4.8 |  | $ 4.8 |  | $ 4.3
Deferred revenue, recognized | $ 4.0 | $ 4.3 | $ 11.8 | $ 11.8 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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