Business Acquisitions - Schedule of Purchase Price Allocation, Microsemi (Details) - USD ($) $ in Millions	Dec. 31, 2019	Mar. 31, 2019	May 29, 2018
Assets acquired
Goodwill	$ 6,664.8	$ 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)
Purchase price allocated			$ 8,244.5