Activity Related to Inventory Reserves (Detail) - USD ($) $ in Millions |
12 Months Ended | ||||||
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Dec. 31, 2017 |
[1] | Dec. 31, 2016 |
Dec. 31, 2015 |
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| Inventory [Line Items] | |||||||
| Inventory reserve, January 1 | $ (1.8) | $ (2.0) | $ (1.7) | ||||
| Additions | (0.1) | (1.1) | |||||
| Write-offs | 0.6 | 0.3 | 0.8 | ||||
| Inventory reserve, December 31 | $ (1.2) | $ (1.8) | [1] | $ (2.0) | |||
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- Definition Amount of inventory reserves for last-in first-out (LIFO) and other inventory valuation methods. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of valuation reserve for inventory. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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