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Acquisitions (Narrative) (Details) $ in Millions				6 Months Ended	12 Months Ended
Acquisitions (Narrative) (Details) $ in Millions	Mar. 01, 2019 USD ($)	Feb. 25, 2019 USD ($)	Apr. 13, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) Business Businesses	Dec. 31, 2018 USD ($) Business	Dec. 31, 2017 USD ($) Business
Business Acquisition [Line Items]
Revenues of pending product lines disposal					$ 170.0
Net cash consideration					$ 331.3	$ 2,173.3	$ 385.8
Number of segments \| Business					3
Goodwill					$ 217.1	1,275.4	$ 264.8
GE Biopharma Acquisition
Business Acquisition [Line Items]
Consideration transferred		$ 21,000.0
Pension liabilities assumed		$ 400.0
Proceeds from underwritten public offerings of stock	$ 3,000.0
Proceeds from issuance of debt				$ 10,800.0
Proceeds from commercial paper borrowings and cash on hand					7,200.0
Transaction costs				$ 93.0	$ 93.0
IDT
Business Acquisition [Line Items]
Net cash consideration			$ 2,100.0			2,078.2
Revenue reported by acquired entity for last annual period			260.0
Goodwill			$ 1,200.0			1,212.6
Transaction costs						$ 15.0
Other businesses acquired
Business Acquisition [Line Items]
Number of businesses acquired					5	1	9
Net cash consideration					$ 331.0	$ 95.1	$ 386.0
Revenue reported by acquired entity for last annual period					72.0	53.0	160.0
Goodwill					$ 217.0	62.8	$ 265.0
Fair value adjustment to inventory \| IDT
Business Acquisition [Line Items]
Fair value adjustments to inventory						$ 1.0