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Acquisition of MPG Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 06, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Business Acquisition, Share Price | $ 13.50 |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 0.5 |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  | $ 2,858.1 | $ 28.8
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  |  |  |  |  |  |  | $ 2.57 | $ 1.64
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost |  |  |  |  |  |  |  | $ 20.0 |
Acquisition-related fair value inventory adjustment |  | $ 0.0 |  |  | $ 0.0 |  |  | (24.9) | $ 0.0
Restructuring and acquisition-related costs |  | 22.8 |  |  | $ 0.0 |  |  | 90.5 | 0.0
Metaldyne Performance Group, Inc. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contractual purchase price |  |  | $ 1,530.2 |  |  |  |  |  |
Proposed Business Acquisition Net Debt to be Assumed by Acquiring Entity |  |  | $ 1,700.0 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $ 1,918.7 |  |  |  |  |  |  |  |
Cash acquired | (202.1) |  |  |  |  |  |  |  |
Proceeds from Notes Payable |  |  |  | $ 1,200.0 |  |  |  |  |
Goodwill, Purchase Accounting Adjustments |  | $ 18.0 |  |  |  |  |  |  |
Intangible assets | 1,223.1 |  |  |  |  |  |  |  |
Adjustment to contractual purchase price for settlement of existing accounts payable balance | (12.4) |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  | $ 1,351.0 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  |  |  | $ 42.0 |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  | 5,300.0 | 5,100.0
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  |  | 290.0 | $ 170.0
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost |  |  |  |  |  |  | $ 20.0 | 20.0 |
Acquisition-related fair value inventory adjustment |  |  |  |  |  |  | 24.9 | 24.9 |
Restructuring and acquisition-related costs |  |  |  |  |  |  | 22.0 | 55.0 |
MPG Pro Forma Net Income Adjustment |  |  |  |  |  |  | $ 45.0 | $ 65.0 |
6.25% Notes due 2025 [Member] | Metaldyne Performance Group, Inc. [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Notes Payable |  |  |  | $ 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] |  |  |  |  |  |  |  |  |
Proceeds from Notes Payable |  |  |  | $ 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 Fair Value Inventory Adjustment from Acquisition of MPG - Inventory in process written up to fair value in purchase accounting that was sold in the period. Cost of goods sold (inventory) artificially high due to fair value mark up. + References No definition available. + Details
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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a 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=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + 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=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: 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=84161108&loc=d3e4845-128472 + Details
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