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General (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2016
Income Tax Examination [Line Items] |  |  |  |  |  |
Provision (benefit) for income taxes |  | $ 35.2 | $ (0.7) | $ 37.4 | $ 1.3 |
New Accounting Guidance [Abstract] |  |  |  |  |  |
Net periodic benefit cost | [1] | 0.6 | 0.7 | 2.2 | 2.2 |
United States Tax Reform [Member] |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Provision (benefit) for income taxes |  | 35.7 |  |  |  |
Luvata HTS [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired ownership interest by the entity |  |  |  |  |  | 100.00%
ASU 2017-07 [Member] | Other Income and Expense [Member] |  |  |  |  |  |
New Accounting Guidance [Abstract] |  |  |  |  |  |
Net periodic benefit cost |  | $ 0.6 | 0.7 | 2.2 | 2.2 |
ASU 2017-07 [Member] | Cost of Sales [Member] |  |  |  |  |  |
New Accounting Guidance [Abstract] |  |  |  |  |  |
Net periodic benefit cost |  |  | (0.3) |  | (0.9) |
ASU 2017-07 [Member] | SG&A [Member] |  |  |  |  |  |
New Accounting Guidance [Abstract] |  |  |  |  |  |
Net periodic benefit cost |  |  | $ (0.4) |  | $ (1.3) |
ASU 2016-09 [Member] |  |  |  |  |  |
New Accounting Guidance [Abstract] |  |  |  |  |  |
Cumulative increase to deferred tax assets |  |  |  | 0.4 |  |
Cumulative increase to equity |  |  |  | $ 0.4 |  |
[1] | Represents net periodic benefit cost, exclusive of service cost, for the Company's pension and postretirement plans.

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