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Special (Income) Charges and Other, Net - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Employee separation costs | $ 3.3 | $ 0.1 |  |  | $ 60.5 | $ 1.5 |
Contract exit costs | 0.1 | (0.1) |  |  | (2.9) | 0.6 |
Non-restructuring contract exit costs and other | $ 0.0 | 0.1 |  |  | 0.0 | 19.6 |
Supply commitment, period | 10 years |  |  |  |  |  |
Gain on sale of assets | $ 0.0 | $ 0.0 |  |  | 0.0 | $ 4.4 |
Restructuring reserve | $ 51.5 |  |  |  | 51.5 |  | $ 47.2
Contract termination |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Non-restructuring contract exit costs and other |  |  | $ 19.5 |  |  |  |
Contract termination fee, period | 5 years |  |  |  |  |  |
Employee Separation Costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring reserve | $ 13.5 |  |  |  | 13.5 |  | $ 0.8
Semiconductor products |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Employee separation costs | 3.3 |  |  |  |  |  |
Contract exit costs | 0.1 |  |  |  |  |  |
Semiconductor products | Contract termination |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred to date | 42.6 |  |  |  | 42.6 |  |
Semiconductor products | Employee Separation Costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs incurred to date | $ 110.4 |  |  |  | $ 110.4 |  |
Micrel Incorporated |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Proceeds from sale of property, plant, and equipment |  |  |  | $ 10.0 |  |  |
San Jose Facility | Micrel Incorporated |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Gain on sale of assets |  |  |  | $ 4.4 |  |  |

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