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Business Acquisitions - Narrative, Microsemi (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
May 29, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Acquisition of Microsemi, net of cash acquired |  | $ 0.0 | $ 7,850.6 | $ 0.0
Microsemi Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid for shares | $ 8,190.0 |  |  |
Non cash consideration of certain share-based payment awards | 53.9 |  |  |
Total consideration transferred | 8,240.0 |  |  |
Liabilities assumed | 3,232.6 |  |  |
Payments to acquire businesses portion funded by additional line of credit borrowings | 8,100.0 |  |  |
Transaction and other fees incurred in transaction | $ 22.0 |  |  |
Useful life | 13 years |  |  |
Deferred tax liabilities | $ 856.7 |  |  |
Microsemi Corporation | Backlog |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life | 1 year |  |  |
Microsemi Corporation | Term Loan Facility |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to acquire businesses portion funded by additional line of credit borrowings | $ 3,000.0 |  |  |
Microsemi Corporation | Senior Secured Notes |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to acquire businesses portion funded by additional line of credit borrowings | 2,000.0 |  |  |
Microsemi Corporation | Revolving Credit Facility |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to acquire businesses portion funded by additional line of credit borrowings | 3,100.0 |  |  |
Microsemi Corporation | Other Liabilities |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition of Microsemi, net of cash acquired | $ 2,060.0 |  |  |

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