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Business Acquisitions - Narrative, Microsemi (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
May 29, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Acquisition of Microsemi, net of cash acquired |  | $ 7,850.6 | $ 0.0 | $ 0.0 |
Net sales |  | 5,349.5 | 3,980.8 | 3,407.8 |
Net Income (Loss) |  | 355.9 | $ 255.4 | $ 164.6 |
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 | 3,230.0 | 3,232.6 |  |  | $ 3,183.3
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 (in years) | 13 years |  |  |  |
Deferred tax liabilities | $ 856.7 |  |  |  |
Net sales |  | 1,568.6 |  |  |
Net Income (Loss) |  | $ (570.8) |  |  |
Revolving Credit Facility | Microsemi Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses portion funded by additional line of credit borrowings | 3,100.0 |  |  |  |
Term Loan Facility | Microsemi Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses portion funded by additional line of credit borrowings | 3,000.0 |  |  |  |
Senior Secured Notes | Microsemi Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses portion funded by additional line of credit borrowings | $ 2,000.0 |  |  |  |
Backlog | Microsemi Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Useful life (in years) | 1 year | 1 year |  |  |
Other Liabilities | Microsemi Corporation |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition of Microsemi, net of cash acquired | $ 2,060.0 |  |  |  |

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