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Business Acquisitions - Narrative, Microsemi (Details) - USD ($) $ in Millions		3 Months Ended
	May 29, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Acquisition of Microsemi, net of cash acquired		$ 0.0	$ 7,851.2
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
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
Microsemi Corporation \| Backlog
Business Acquisition [Line Items]
Useful life (in years)	1 year
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
Other Liabilities \| Microsemi Corporation
Business Acquisition [Line Items]
Acquisition of Microsemi, net of cash acquired	$ 2,060.0