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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |
Beginning balance | $ 1,654.3 | $ 154.0 |
Goodwill, Impairment Loss | (485.5) | 0.0 | $ 0.0
Goodwill, Written off Related to Sale of Business Unit | (15.1) |  |
Goodwill, Translation and Purchase Accounting Adjustments | (14.1) | 27.5 |
Ending balance | 1,141.8 | 1,654.3 | 154.0
Driveline [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 211.1 | 130.1 |
Goodwill, Impairment Loss | 0.0 |  |
Goodwill, Written off Related to Sale of Business Unit | 0.0 |  |
Goodwill, Translation and Purchase Accounting Adjustments | (0.3) | 0.6 |
Ending balance | 212.1 | 211.1 | 130.1
Metal Forming [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 558.9 | 23.9 |
Goodwill, Impairment Loss | 0.0 |  |
Goodwill, Written off Related to Sale of Business Unit | 0.0 |  |
Goodwill, Translation and Purchase Accounting Adjustments | (7.4) | 19.7 |
Ending balance | 552.4 | 558.9 | 23.9
Powertrain [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 478.8 | 0.0 |
Goodwill, Impairment Loss | (80.0) |  |
Goodwill, Written off Related to Sale of Business Unit | (15.1) |  |
Goodwill, Translation and Purchase Accounting Adjustments | (6.4) | 7.2 |
Ending balance | 377.3 | 478.8 | 0.0
Casting [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 405.5 | 0.0 |
Goodwill, Impairment Loss | (405.5) |  |
Goodwill, Written off Related to Sale of Business Unit | 0.0 |  |
Goodwill, Translation and Purchase Accounting Adjustments | 0.0 | 0.0 |
Ending balance | 0.0 | 405.5 | $ 0.0
Metaldyne Performance Group, Inc. [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0.9 | 1,392.4 |
Metaldyne Performance Group, Inc. [Member] | Driveline [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0.0 | 0.0 |
Metaldyne Performance Group, Inc. [Member] | Metal Forming [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0.9 | 515.3 |
Metaldyne Performance Group, Inc. [Member] | Powertrain [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0.0 | 471.6 |
Metaldyne Performance Group, Inc. [Member] | Casting [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0.0 | 405.5 |
USM Mexico Manufacturing LLC [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 1.3 | 80.4 |
USM Mexico Manufacturing LLC [Member] | Driveline [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 1.3 | 80.4 |
USM Mexico Manufacturing LLC [Member] | Metal Forming [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0.0 | 0.0 |
USM Mexico Manufacturing LLC [Member] | Powertrain [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | 0.0 | 0.0 |
USM Mexico Manufacturing LLC [Member] | Casting [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period | $ 0.0 | $ 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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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