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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Income tax expense | $ 7.5 | $ 15.3 |
Effective income tax rate, continuing operations | 8.70% | 20.00% |
Unrecognized tax benefit liability, including penalties and accrued interest | $ 38.5 |  | $ 30.7
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | $ 26.1 |
Metaldyne Performance Group, Inc. [Member] |  |  |
Notes Issued | 1,200.0 |  |
6.25% Notes due 2025 [Member] | Metaldyne Performance Group, Inc. [Member] |  |  |
Notes Issued | $ 700.0 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |
6.50% Notes due 2027 [Member] | Metaldyne Performance Group, Inc. [Member] |  |  |
Notes Issued | $ 500.0 |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |  |

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