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Business Combinations Acquisition of MPG Narrative (Details) - USD ($) $ in Millions		3 Months Ended
	Apr. 06, 2017	Mar. 31, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Proceeds from Issuance of Long-term Debt		$ 1,209.4	$ 6.2
Metaldyne Performance Group, Inc. [Member]
Business Acquisition [Line Items]
Contractual purchase price		1,500.0
Proposed Business Acquisition Net Debt to be Assumed by Acquiring Entity		1,700.0
Noncash or Part Noncash Acquisition, Debt Assumed		1,900.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		200.0
Notes Issued		1,200.0
Business Acquisition, Pro Forma Revenue		1,800.0	$ 1,700.0
6.25% Notes due 2025 [Member] | Metaldyne Performance Group, Inc. [Member]
Business Acquisition [Line Items]
Notes Issued		$ 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]
Notes Issued		$ 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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Represents the net debt amount (debt less cash and cash equivalents) of the acquired entity that is expected to be assumed by the acquiring entity in a proposed business acquisition.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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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.

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Contractual interest rate for funds borrowed, under the debt agreement.

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