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Revenue Recognition (Volume Commitment Programs) (Details) - Volume commitment programs - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Commitment contract assets |  | $ 70.5 | $ 40.9
Commitment contract assets reclassified to accounts receivable | $ 2.0 | $ 7.0 |

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