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Intangible Assets Acquired Table (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | $ 1,254.8
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 13 years 7 months
Metaldyne Performance Group, Inc. [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | $ 1,223.1
Metaldyne Performance Group, Inc. [Member] | Customer Platforms - Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | 950.0
Finite-Lived Intangible Assets, Purchase Accounting Adjustments | $ 20.0 |
Metaldyne Performance Group, Inc. [Member] | Customer Relationships - Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | 151.8
Finite-Lived Intangible Assets, Purchase Accounting Adjustments | $ 1.5 |
Metaldyne Performance Group, Inc. [Member] | Technology-Based Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | 121.3
USM Mexico Manufacturing LLC [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | 31.7
USM Mexico Manufacturing LLC [Member] | Customer Platforms - Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | 2.2
USM Mexico Manufacturing LLC [Member] | Technology-Based Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived Intangible Assets Acquired |  | $ 29.5

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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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