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Business Combinations Acquisition of MPG Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 06, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Business Acquisition [Line Items] |  |  |
Proceeds from Issuance of Long-term Debt |  | $ 1,209.4 | $ 6.2
Metaldyne Performance Group, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Contractual purchase price |  | 1,500.0 |
Proposed Business Acquisition Net Debt to be Assumed by Acquiring Entity |  | 1,700.0 |
Noncash or Part Noncash Acquisition, Debt Assumed |  | 1,900.0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 200.0 |
Notes Issued |  | 1,200.0 |
Business Acquisition, Pro Forma Revenue |  | 1,800.0 | $ 1,700.0
6.25% Notes due 2025 [Member] | Metaldyne Performance Group, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Notes Issued |  | $ 700.0 |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.25% |
6.50% Notes due 2027 [Member] | Metaldyne Performance Group, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Notes Issued |  | $ 500.0 |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.50% |
Term Loan A [Member] | Metaldyne Performance Group, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from Issuance of Long-term Debt | $ 100.0 |  |
Term Loan B [Member] | Metaldyne Performance Group, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from Issuance of Long-term Debt | $ 1,550.0 |  |

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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + 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 (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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