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Acquisitions, Modine Puxin Thermal Systems (Jiangsu) Co. Ltd (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 29, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Purchase price allocation, net of cash |  | $ 0.0 | $ 364.2 | $ 1.4
Modine Puxin Thermal System (Jiangsu) Co. Ltd. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage | 67.00% |  |  |
Purchase price allocation, net of cash | $ 1.4 |  |  |
Additional cash consideration amount |  |  | $ 0.3 |
Purchase price allocation resulted in acquired equipment and other assets | 2.3 |  |  |
Purchase price allocation resulted in property, plant and equipment/acquired equipment and other long-lived assets | 1.5 |  |  |
Purchase price allocation, working capital net assets | $ 0.8 |  |  |
Jiangsu Puxin Heat Exchange System Co., Ltd [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Ownership percentage by parent | 33.00% |  |  |

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