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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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