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Revenue Recognition - Narrative (Details)	3 Months Ended	9 Months Ended
Revenue Recognition - Narrative (Details)	Sep. 30, 2019 segment	Sep. 30, 2019 product_category segment
Disaggregation of Revenue [Line Items]
Refund period		90 days
Number of principal categories of products \| product_category		6
Number of business segments \| segment	4	4
Maximum
Disaggregation of Revenue [Line Items]
Contract with customer, contract term		1 year