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Other Expense, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Restructuring expense | $ 14.0 |  | $ 5.0 | $ 41.0 | $ 44.0
Merger, acquisition and divestiture expense | 4.0 |  | 2.0 | 10.0 | 5.0
Other operating expense |  | $ 14.0 |  | 12.0 |
Other operating income |  |  |  |  | (7.0)
Other expense, net | $ 18.0 |  | $ 7.0 | $ 63.0 | 42.0
Remy International Inc. [Member] |  |  |  |  |
Other operating income |  |  |  |  | $ (4.0)

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