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v3.20.1

Special Charges and Other, Net - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |
Costs associated with restructuring | $ 18.0 |  |
Asset impairment charges | 2.5 |  |
Remaining associated costs with restructuring activities (less than) | 10.0 |  |
Net charges related to legal settlements | 15.7 | $ (30.2) | $ 0.0
Non-restructuring contract exit costs and other | 0.0 | 0.0 | 20.0
Employee separation costs | 6.0 | 65.3 | 1.2
Gain on sale of assets | 1.5 | 0.0 | 4.4
Contract exit costs (income) | 13.4 | (4.7) | 0.7
Restructuring reserve | 24.3 | 47.8 | 47.2
Atmel Corporation |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee separation costs |  |  | 1.2
Micrel Incorporated |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Proceeds from sale of property, plant, and equipment |  |  | 10.0
Gain on sale of assets |  |  | 4.4
Contract Termination |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring cost incurred | 8.2 |  |
Non-restructuring contract exit costs and other |  |  | $ 19.5
Termination period |  |  | 5 years
Supply agreement term |  |  | 10 years
Contract Termination | Semiconductor Products |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and related cost, costs incurred to date | 53.5 |  |
Other Relocation Costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring cost incurred | 6.6 |  |
Restructuring reserve | 12.0 | 15.7 | $ 19.1
Employee Separation |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 6.1 | 12.9 | 0.8
Employee Separation | Semiconductor Products |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Employee separation costs | 6.0 | $ 65.3 | $ 1.2
Restructuring and related cost, costs incurred to date | $ 111.6 |  |

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