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Goodwill and Intangible Assets - Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Beginning balance |  | $ 1,141.8 | $ 1,654.3
Impairment charge |  | (440.0) | (485.5)
Sale of business |  |  | (15.1)
Foreign currency translation |  | (2.7) | (14.1)
Reorganization |  | 0.0 |
Ending balance | $ 699.1 | 699.1 | 1,141.8
Goodwill, Impaired, Accumulated Impairment Loss | 925.5 | 925.5 |
Driveline [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance |  | 212.1 | 211.1
Impairment charge |  | 0.0 | 0.0
Sale of business |  |  | 0.0
Foreign currency translation |  | (1.0) | (0.3)
Reorganization |  | 187.2 |
Ending balance | 398.3 | 398.3 | 212.1
Metal Forming [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance |  | 552.4 | 558.9
Impairment charge | (440.0) | (440.0) | 0.0
Sale of business |  |  | 0.0
Foreign currency translation |  | (1.7) | (7.4)
Reorganization |  | 190.1 |
Ending balance | 300.8 | 300.8 | 552.4
Powertrain [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance |  | 377.3 | 478.8
Impairment charge |  | 0.0 | (80.0)
Sale of business |  |  | (15.1)
Foreign currency translation |  | 0.0 | (6.4)
Reorganization |  | (377.3) |
Ending balance | 0.0 | 0.0 | 377.3
Casting [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance |  | 0.0 | 405.5
Impairment charge |  | 0.0 | (405.5)
Sale of business |  |  | 0.0
Foreign currency translation |  | 0.0 | 0.0
Reorganization |  | 0.0 |
Ending balance | $ 0.0 | $ 0.0 | 0.0
Metaldyne Performance Group, Inc. [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  |  | 0.9
Metaldyne Performance Group, Inc. [Member] | Driveline [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  |  | 0.0
Metaldyne Performance Group, Inc. [Member] | Metal Forming [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  |  | 0.9
Metaldyne Performance Group, Inc. [Member] | Powertrain [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  |  | 0.0
Metaldyne Performance Group, Inc. [Member] | Casting [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  |  | 0.0
USM Mexico Manufacturing LLC [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  |  | 1.3
USM Mexico Manufacturing LLC [Member] | Driveline [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  |  | 1.3
USM Mexico Manufacturing LLC [Member] | Metal Forming [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  |  | 0.0
USM Mexico Manufacturing LLC [Member] | Powertrain [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  |  | 0.0
USM Mexico Manufacturing LLC [Member] | Casting [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill acquired |  |  | $ 0.0

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