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Revenue Recognition (Volume Commitment Programs) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Volume commitment programs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commitment contract assets | $ 91.6 | $ 91.6 | $ 83.9
Commitment contract assets reclassified to accounts receivable | 4.7 | 9.6 |
Up front customer loyalty programs and volume commitment programs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Estimation of future revenues | $ 2,000.0 | $ 2,000.0 |

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