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Repayment of MPG Indebtedness (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Apr. 06, 2017
Debt Instrument [Line Items] |  |  |  |  |
Debt refinancing and redemption costs | $ 0.0 | $ 0.0 | $ 2.7 | $ 0.0 |
Metaldyne Performance Group, Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  | $ 1,918.7
Interest Paid |  |  | $ 24.6 |  |
Euro Denominated Term Loan [Member] | Metaldyne Performance Group, Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  | 200.0
U.S. Dollar Denominated Term Loan [Member] [Member] | Metaldyne Performance Group, Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  | 1,000.0
MPG Bonds [Member] | Metaldyne Performance Group, Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  |  |  |  | $ 700.0

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- Definition Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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