Business Acquisitions Business Acquisitions (Mircosemi - Schedule of Purchase Price Allocation) (Details) - USD ($) $ in Millions	Jun. 30, 2018	May 29, 2018	Mar. 31, 2018
Assets acquired
Goodwill	$ 7,273.2		$ 2,299.0
Microsemi Corporation
Assets acquired
Cash and cash equivalents		$ 340.0
Accounts receivable		216.1
Inventories		716.8
Prepaid expenses and other current assets		66.6
Property, plant and equipment, net		241.2
Goodwill		4,974.2
Purchased intangible assets		4,722.0
Long-term deferred tax assets		19.2
Other assets		101.2
Total assets acquired		11,397.3
Liabilities assumed
Accounts payable		(226.9)
Other current liabilities		(174.8)
Long-term line of credit		(2,056.9)
Deferred tax liabilities		(545.7)
Long-term income tax payable		(101.6)
Other long-term liabilities		(46.3)
Total liabilities assumed		(3,152.2)
Purchase price allocated		$ 8,245.1