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Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of Intangible Assets | $ 9.5 | $ 10.0 | $ 10.0
Gross carrying amount | 156.2 | 193.7 |
Accumulated amortization | (59.9) | (64.0) |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2020 | 8.0 |  |
2021 | 8.0 |  |
2022 | 8.0 |  |
2023 | 8.0 |  |
2024 | 8.0 |  |
Accumulated goodwill impairment | 241.0 | 241.0 | $ 241.0
Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 76.8 | 93.4 |
Accumulated amortization | (29.7) | (31.9) |
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 27.0 | 35.7 |
Accumulated amortization | (9.3) | (10.6) |
Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 52.4 | 64.6 |
Accumulated amortization | (20.9) | $ (21.5) |
Cast Products |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Period Increase (Decrease) | (23.8) |  |
Gross carrying amount | 33.2 |  |
Accumulated amortization | (12.7) |  |
Cast Products, Salem Oregon |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 4.3 |  |
Accumulated amortization | $ (1.0) |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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