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Acquisitions (Narratives) (Details) - USD ($)
$ in Millions
9 Months Ended
Jan. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]      
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     $ 3.0
The results of operations for DSI:      
Busniess combination purchase accounting inventory fair value step up amortization     3.8
Intangible asset amortization expense     $ 2.9