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Acquisition of MPG Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 06, 2017 | Mar. 31, 2018 | Jun. 30, 2017 | Mar. 31, 2017
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 |  | $ 431.4 |  | $ 1,209.4
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  |  |  | $ 0.83
Metaldyne Performance Group, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total consideration transferred |  |  | $ 1,530.2 |
Net debt acquired |  |  | $ 1,700.0 |
Debt acquired | $ 1,918.7 |  |  |
Cash acquired | (202.1) |  |  |
Proceeds from Notes Payable |  |  |  | $ 1,200.0
Goodwill, purchase accounting adjustments |  | 0.9 |  |
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 |  | 738.0 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | $ 40.0 |  |
Business Acquisition, Pro Forma Revenue |  |  |  | 1,800.0
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  | 95.0
MPG Pro Forma Net Income Adjustment |  |  |  | 20.0
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 [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 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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