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Summary of Significant Accounting Policies - Warranty Activity (Details) - Warranty Reserves - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Movement in Extended Product Warranty Accrual [Roll Forward] |  |  |
Balance at beginning of period | $ 36.7 | $ 29.9 |
Amounts accrued | 21.9 | 34.5 |
Warranties charged to accrual | (25.0) | (27.7) |
Remeasurement of obligations under Topic 606 |  |  | $ 2.8
Balance at end of period | 36.4 | 36.7 |
Correction |  |  |
Movement in Extended Product Warranty Accrual [Roll Forward] |  |  |
Balance at beginning of period | $ 39.5 |  |
Balance at end of period |  | $ 39.5 |

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- Definition Standard Product Warranty Accrual, Remeasurement Adjustment + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty. Excludes extended product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(2)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Amount of increase in the standard product warranty accrual from warranties issued. Excludes extended product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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