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Revenue Recognition (Volume Commitment Programs) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Volume commitment programs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Commitment contract assets | $ 134.7 | $ 134.7 | $ 115.5
Commitment contract assets reclassified to accounts receivable | 6.7 | 13.6 |
Up front customer loyalty programs and volume commitment programs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Estimation of future revenues | $ 2,500.0 | $ 2,500.0 |

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