Business Acquisitions - Schedule of Purchase Price Allocation, Microsemi (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	May 29, 2018
Assets acquired
Goodwill	$ 6,663.9	$ 6,663.9
Microsemi Corporation
Assets acquired
Cash and cash equivalents	340.0
Accounts receivable	215.6
Inventories	576.2
Other current assets	85.2
Property, plant and equipment	201.5
Goodwill	4,364.9
Purchased intangible assets	5,634.5
Long-term deferred tax assets	5.9
Other assets	53.3
Total assets acquired	11,477.1
Liabilities assumed
Accounts payable	(233.8)
Other current liabilities	(149.3)
Long-term debt	(2,056.9)
Deferred tax liabilities	(565.1)
Long-term income tax payable	(177.7)
Other long-term liabilities	(49.8)
Total liabilities assumed	(3,232.6)		$ (3,230.0)
Purchase price allocated	$ 8,244.5