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Commitments and Contingencies Metaldyne (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2018 | Mar. 31, 2018
Selling, General and Administrative Expenses [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency Accrual, Period Increase (Decrease) | $ (8.2) | $ (8.2)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Period Type: | duration

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- Definition Amount of increase (decrease) in loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |