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Issuance of New Notes Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Debt Instrument [Line Items] |  |  |
Payments of Debt Issuance Costs |  | $ 90.8 | $ 0.0
6.25% Notes Due 2025 & 6.50% Notes Due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Payments of Debt Issuance Costs |  | $ 36.9 |
Metaldyne Performance Group, Inc. [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Notes Payable | $ 1,200.0 |  |
Metaldyne Performance Group, Inc. [Member] | 6.25% Notes due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Notes Payable | $ 700.0 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |
Metaldyne Performance Group, Inc. [Member] | 6.50% Notes due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Notes Payable | $ 500.0 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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