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Goodwill Rollforward (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2017 USD ($)
Goodwill [Roll Forward] |
Goodwill | $ 154.0
Goodwill, Foreign Currency Translation Gain (Loss) | 25.9
Goodwill | 1,654.6
Driveline [Member] |
Goodwill [Roll Forward] |
Goodwill | 130.1
Goodwill, Foreign Currency Translation Gain (Loss) | 0.4
Goodwill | 210.9
Metal Forming [Member] |
Goodwill [Roll Forward] |
Goodwill | 23.9
Goodwill, Foreign Currency Translation Gain (Loss) | 16.6
Goodwill | 556.5
Powertrain [Member] |
Goodwill [Roll Forward] |
Goodwill | 0.0
Goodwill, Foreign Currency Translation Gain (Loss) | 8.9
Goodwill | 481.2
Casting [Member] |
Goodwill [Roll Forward] |
Goodwill | 0.0
Goodwill, Foreign Currency Translation Gain (Loss) | 0.0
Goodwill | 406.0
Metaldyne Performance Group, Inc. [Member] |
Goodwill [Roll Forward] |
Goodwill, Acquired During Period | 1,394.3
Metaldyne Performance Group, Inc. [Member] | Driveline [Member] |
Goodwill [Roll Forward] |
Goodwill, Acquired During Period | 0.0
Metaldyne Performance Group, Inc. [Member] | Metal Forming [Member] |
Goodwill [Roll Forward] |
Goodwill, Acquired During Period | 516.0
Metaldyne Performance Group, Inc. [Member] | Powertrain [Member] |
Goodwill [Roll Forward] |
Goodwill, Acquired During Period | 472.3
Metaldyne Performance Group, Inc. [Member] | Casting [Member] |
Goodwill [Roll Forward] |
Goodwill, Acquired During Period | 406.0
USM Mexico Manufacturing LLC [Member] |
Goodwill [Roll Forward] |
Goodwill, Acquired During Period | 80.4
USM Mexico Manufacturing LLC [Member] | Driveline [Member] |
Goodwill [Roll Forward] |
Goodwill, Acquired During Period | 80.4
USM Mexico Manufacturing LLC [Member] | Metal Forming [Member] |
Goodwill [Roll Forward] |
Goodwill, Acquired During Period | 0.0
USM Mexico Manufacturing LLC [Member] | Powertrain [Member] |
Goodwill [Roll Forward] |
Goodwill, Acquired During Period | 0.0
USM Mexico Manufacturing LLC [Member] | Casting [Member] |
Goodwill [Roll Forward] |
Goodwill, Acquired During Period | $ 0.0

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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