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Goodwill and Intangible Assets Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years |  |
Finite-Lived Intangible Assets, Gross | $ 295.0 | $ 146.3 |
Finite-Lived Intangible Assets, Accumulated Amortization | (97.6) | (88.5) |
Amortization expense | 15.0 | 11.9 | $ 17.3
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 25.8 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 25.4 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 23.4 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 17.3 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 17.1 |  |
Government grants | $ 0.4 | 1.1 | $ 8.7
Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years |  |
Finite-Lived Intangible Assets, Gross | $ 246.3 | 119.3 |
Finite-Lived Intangible Assets, Accumulated Amortization | $ (88.2) | (81.6) |
Unpatented Technology [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 12 years |  |
Finite-Lived Intangible Assets, Gross | $ 26.8 | 8.2 |
Finite-Lived Intangible Assets, Accumulated Amortization | $ (4.5) | (3.1) |
Use Rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 50 years |  |
Finite-Lived Intangible Assets, Gross | $ 13.4 | 12.7 |
Finite-Lived Intangible Assets, Accumulated Amortization | $ (1.2) | (0.9) |
Use Rights [Member] | Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 50 years |  |
Trademarks and Trade Names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years |  |
Finite-Lived Intangible Assets, Gross | $ 5.5 | 4.9 |
Finite-Lived Intangible Assets, Accumulated Amortization | $ (2.9) | (2.2) |
Patents [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years |  |
Finite-Lived Intangible Assets, Gross | $ 3.0 | 1.2 |
Finite-Lived Intangible Assets, Accumulated Amortization | (0.8) | (0.7) |
Other Noncurrent Liabilities [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Government grants | 8.7 | 8.2 |
Other Current Liabilities [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Government grants | $ 0.5 | $ 0.4 |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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