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Acquisition of Luvata HTS (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired goodwill | [1] |  |  |  | $ 1.3 |  |
Allocation of Purchase price for Acquisition [Abstract] |  |  |  |  |  |  |
Goodwill |  |  | $ 171.4 |  | 171.4 |  | $ 165.1
Net earnings per share attributable to Modine Shareholders [Abstract] |  |  |  |  |  |  |
Interest expense |  |  | 6.6 | $ 3.0 | 13.2 | $ 6.0 |
Commercial and Industrial Solutions ("CIS") [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net sales |  |  |  |  | 306.7 |  |
Operating income |  |  |  |  | 18.9 |  |
Acquired goodwill | [1] |  |  |  | 1.3 |  |
Allocation of Purchase price for Acquisition [Abstract] |  |  |  |  |  |  |
Goodwill |  |  | $ 156.5 |  | $ 156.5 |  | $ 150.9
Luvata HTS [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired ownership interest by the entity |  | 100.00% |  |  |  |  |
Purchase price allocation, net of cash |  | $ 388.2 |  |  |  |  |
Allocation of Purchase price for Acquisition [Abstract] |  |  |  |  |  |  |
Cash and cash equivalents |  | 27.4 |  |  |  |  |
Trade accounts receivable |  | 86.1 |  |  |  |  |
Inventories |  | 55.0 |  |  |  |  |
Property, plant and equipment |  | 120.4 |  |  |  |  |
Intangible assets |  | 130.2 |  |  |  |  |
Goodwill |  | 151.9 |  |  |  |  |
Other assets |  | 39.1 |  |  |  |  |
Accounts payable |  | (73.7) |  |  |  |  |
Accrued compensation and employee benefits |  | (24.3) |  |  |  |  |
Deferred income taxes |  | (39.5) |  |  |  |  |
Pensions |  | (14.3) |  |  |  |  |
Other liabilities |  | (42.7) |  |  |  |  |
Purchase price |  | $ 415.6 |  |  |  |  |
Pro Forma Information [Abstract] |  |  |  |  |  |  |
Net sales |  |  |  | 466.1 |  | 953.8 |
Net earnings attributable to Modine |  |  |  | $ 2.3 |  | $ 18.3 |
Net earnings per share attributable to Modine Shareholders [Abstract] |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  | $ 0.05 |  | $ 0.37 |
Diluted (in dollars per share) |  |  |  | $ 0.05 |  | $ 0.37 |
Amortization and depreciation expense |  |  |  | $ 3.2 |  |  |
Interest expense |  |  |  | 3.5 |  |  |
Acquisition related transaction costs |  |  |  | $ 4.4 |  | $ 4.4 |
[1] | During the first six months of fiscal 2018, the Company recorded a $1.3 million increase to goodwill as a result of measurement period adjustments made in connection with purchase accounting for the acquisition of Luvata HTS. See Note 2 for additional information.

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