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Share-Based Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | May 29, 2018
Stock-based compensation expense [Line Items] |  |  |  |  |
Pre-tax effect of share-based compensation | $ 39.6 | $ 24.0 | $ 127.5 | $ 70.0 |
Income tax benefit | 8.2 | 6.6 | 27.3 | 21.9 |
Net income effect of share-based compensation | 31.4 | 17.4 | 100.2 | 48.1 |
Share-based compensation expense previously capitalized | 3.4 |  | 10.9 |  |
Cost of sales |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Pre-tax effect of share-based compensation | 3.4 | 3.5 | 10.9 | 10.6 |
Research and development |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Pre-tax effect of share-based compensation | 19.4 | 10.9 | 53.2 | 31.8 |
Selling, general and administrative |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Pre-tax effect of share-based compensation | 16.6 | 9.6 | 46.1 | 27.6 |
Special (income) charges and other, net |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Pre-tax effect of share-based compensation | 0.2 | 0.0 | 17.3 | 0.0 |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09, Excess Tax Benefit Component |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Income tax benefit | 4.1 | 5.7 | 13.1 | 19.8 |
Restricted Stock Units (RSUs) | Microsemi Corporation |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Pre-tax effect of share-based compensation |  |  | 53.5 |  |
Consideration transferred, equity interests issued |  |  | 175.4 |  |
Compensation cost |  |  | 53.9 |  |
Compensation cost not yet recognized |  |  |  |  | $ 121.5
Accelerated compensation cost |  |  | 17.3 |  |
Inventory |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Share-based compensation expense previously capitalized |  | 3.5 |  | 10.6 |
Capitalized share-based compensation | $ 4.7 | $ 3.1 | 12.6 | $ 8.9 |
Inventory | Restricted Stock Units (RSUs) | Microsemi Corporation |  |  |  |  |
Stock-based compensation expense [Line Items] |  |  |  |  |
Income tax benefit |  |  | $ 2.6 |  |

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