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Revenue Recognition - Narrative 2 (Details) - Consolidated Sales - Product Concentration Risk | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Revenue recognized at a point in time |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Revenue, remaining performance obligation, percentage | 96.40% | 96.90% | 96.40% | 97.20%
Revenue recognized over time |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Revenue, remaining performance obligation, percentage | 3.60% | 3.10% | 3.60% | 2.80%

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