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Revenue Recognition (Volume Commitment Programs) (Details) - Volume commitment programs - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Volume commitment contract assets | $ 83.9 | $ 40.9
Volume commitment contract assets reclassified to accounts receivable | $ 8.9 |

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