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Share-Based Compensation (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 29, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Stock-based compensation expense [Line Items] |  |  |  |  |  |
Share based compensation expense |  | $ 43.5 | $ 39.6 |  | $ 129.5 | $ 127.5
Income tax benefit |  | 9.2 | 8.2 |  | 28.2 | 27.3
Net income effect of share-based compensation |  | 34.3 | 31.4 |  | 101.3 | 100.2
Awards assumed |  |  |  | $ 53.9 |  |
Microsemi Corporation | Restricted Stock Units (RSUs) |  |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |  |
Share based compensation expense |  |  |  |  |  | 53.5
Awards assumed | $ 175.4 |  |  |  |  |
Compensation costs recognized | 53.9 |  |  |  |  |
Total compensation cost not yet recognized | $ 121.5 |  |  |  |  |
Accelerated compensation costs |  |  |  |  |  | 17.3
Inventory |  |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |  |
Capitalized share-based compensation expense |  | 5.1 | 4.7 |  | 15.4 | 12.6
Share-based compensation expense previously capitalized |  | 5.7 | 3.4 |  | 15.8 | 10.9
Inventory | Microsemi Corporation | Restricted Stock Units (RSUs) |  |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |  |
Capitalized share-based compensation expense |  |  |  |  |  | 2.6
Cost of sales |  |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |  |
Share based compensation expense |  | 5.7 | 3.4 |  | 15.8 | 10.9
Research and development |  |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |  |
Share based compensation expense |  | 21.2 | 19.4 |  | 63.0 | 53.2
Selling, general and administrative |  |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |  |
Share based compensation expense |  | 16.6 | 16.6 |  | 50.7 | 46.1
Special charges (income) and other, net |  |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |  |
Share based compensation expense |  | $ 0.0 | $ 0.2 |  | $ 0.0 | $ 17.3

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