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New accounting standards (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jan. 01, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Contract with customer, reverse for returns and allowances | $ 4.6 |
Accounting Standards Update 2016-16 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of change on equity |  | $ 1.8
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Retained Earnings (Accumulated Deficit) |  | $ 1.2

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