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Summary of Significant Accounting Policies Warranties (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Product Warranty Liability [Line Items] |  |  |  |  |  |  |  |
Standard Product Warranty Accrual | $ 8.3 | $ 10.5 | $ 8.3 | $ 10.5 | $ 7.1 | $ 7.4 | $ 9.7 | $ 10.1
Standard Product Warranty Accrual, Decrease for Payments | 0.6 | 0.6 | 1.5 | 1.8 |  |  |  |
Warranty_originations_and_revisions | 1.9 | 1.1 | 2.6 | 1.9 |  |  |  |
Standard Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties | $ (0.1) | $ 0.3 | $ (0.2) | $ 0.3 |  |  |  |
Minimum |  |  |  |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |  |  |  |
Product Warranty Period |  |  | 1 year |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 5 years |  |  |  |  |

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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 increase (decrease) in the standard product warranty accrual from changes in estimates attributable to preexisting product warranties. 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)(4)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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