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Acquisitions - Narrative (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 12, 2014 | Feb. 07, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration, net of cash acquired |  |  | $ 0.0 | $ 0.5 | $ 92.9
Goodwill |  |  | $ 641.9 | 651.4 |
ATI Flowform [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of company acquired |  | 85.00% |  |  |
Cash consideration, net of cash acquired |  | $ 72.9 |  |  |
Noncontrolling interest held by others (percent) |  | 15.00% |  |  |
Acquisition costs |  | $ 0.7 |  |  |
Intangible assets acquired |  | $ 21.4 |  |  |
Weighted average life of acquired intangible assets |  | 23 years |  |  |
Goodwill |  | $ 46.8 |  |  |
Hanard Machine, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration, net of cash acquired | $ 20.5 |  |  | $ 0.5 | $ 20.0
Intangible assets acquired | $ 4.3 |  |  |  |
Weighted average life of acquired intangible assets | 20 years |  |  |  |
Goodwill | $ 8.4 |  |  |  |

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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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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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