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Issuance of New Notes Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Payments of Debt Issuance Costs | $ 6.9 | $ 90.8 |  |  |  |
6.25% Notes Due 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.25% |  |
Payments of Debt Issuance Costs | 6.6 |  |  |  |  |
6.25% Notes Due 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.25% | 6.25% |  |
Metaldyne Performance Group, Inc. [Member] | 6.25% Notes due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.25%
Metaldyne Performance Group, Inc. [Member] | 6.50% Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.50%
Unsecured Debt [Member] | 6.25% Notes Due 2026 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | $ 400.0 |  |  | $ 400.0 | $ 0.0 |
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |  |  |  |
Unsecured Debt [Member] | 6.25% Notes Due 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | $ 0.0 |  |  |  | 400.0 |
Unsecured Debt [Member] | 6.25% Notes due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | $ 700.0 |  |  |  | 700.0 |
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |  |  |  |
Unsecured Debt [Member] | 6.50% Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt | $ 500.0 |  |  |  | $ 500.0 |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  |  |  |  |

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