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Commitments And Contingencies - Narrative (Details) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Product Warranty Liability [Line Items] |  |  |  |
Warranty claims reserves | $ 32,300,000 | $ 32,300,000 | $ 28,600,000 | $ 32,400,000
Standard product warranty, low end of range (in months) | 12 months |  |  |
Standard product warranty, high end of range (in months) | 60 months |  |  |
Product liability reserves | $ 22,800,000 |  | $ 21,700,000 |
Period over which product liability self-insurance retention levels have fluctuated (in years) | 10 years |  |  |
Maximum |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |
Product liability self-insurance maximum retention level for new occurrence | $ 2,000,000 |  |  |

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- Definition Represents the high end of the range of the standard warranty period (in months) provided by the company to its customers. + References No definition available. + Details
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- Definition Present value of the accrual for product liability loss contingencies as of the balance sheet date (if the accrual qualifies for discounting). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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