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Acquisitions Acquisitions Textuals (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 26, 2017 | Oct. 05, 2015 | Mar. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 886.8 | $ 774.7 | $ 778.3 |  |  |
Axtone Railway Components Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Jan. 26, 2017 |  |  |  |  |
Business Acquisition, Name of Acquired Entity | Axtone Railway Components (Axtone) |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 123.1 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  | $ 123.1 |  |
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period |  | $ 72.0 |  |  |  |
Goodwill |  |  |  | $ 83.0 |  |
Wolverine Advanced Materials Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Oct. 05, 2015 |  |  |  |  |
Business Acquisition, Name of Acquired Entity | Wolverine Advanced Materials LLC (Wolverine) |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | 307.0 |  |  |
Goodwill |  |  |  |  | $ 164.2 |
Hartzell Aerospace Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Mar. 31, 2015 |  |  |  |  |
Business Acquisition, Name of Acquired Entity | Environmental Control Systems (f/k/a Hartzell Aerospace) |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 52.9 |  |  |
Goodwill |  |  |  |  |  | $ 13.7

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e848-128460 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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