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Acquisitions (Narratives) (Details) - USD ($) $ in Millions		3 Months Ended	5 Months Ended	6 Months Ended
	Jan. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Jan. 31, 2018
Acquisition purchase price	$ 71.1
Business Acquisition, Description of Acquired Entity				DSI, a St. Paul, Minnesota-based life science research company, is a recognized leader in physiologic monitoring focused on delivering preclinical products, systems, services and solutions to its customers.
Business Acquisition Direct Acquisition Costs In Income Statement			$ 2.6
The results of operations for DSI:
Revenue of Acquiree since Acquisition Date			18.2
Earnings or Loss of Acquiree since Acquisition Date			1.7
Busniess combination purchase accounting inventory fair value step up amortization			3.7
Preliminary amount of inventory fair value step up			3.8
Intangible asset amortization expense			$ 1.8
Data Sciences International, Inc. (DSI) [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Weighted Average Useful Life				9 years 3 months 18 days
Trade Names [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Weighted Average Useful Life				7 years 2 months 12 days
Trade Names [Member] | Data Sciences International, Inc. (DSI) [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Weighted Average Useful Life				9 years 4 months 24 days
Developed Technology [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Weighted Average Useful Life				6 years 7 months 6 days
Developed Technology [Member] | Data Sciences International, Inc. (DSI) [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Weighted Average Useful Life				8 years 2 months 12 days
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Weighted Average Useful Life				10 years 2 months 12 days
Customer Relationships [Member] | Data Sciences International, Inc. (DSI) [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Weighted Average Useful Life				12 years 4 months 24 days
In-process research and development [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Weighted Average Useful Life				6 years 4 months 24 days
In-process research and development [Member] | Data Sciences International, Inc. (DSI) [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Weighted Average Useful Life				7 years 4 months 24 days

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