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Acquisition (Narratives) (Details) - USD ($)
$ in Millions
 11 Months Ended 12 Months Ended
Jan. 31, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
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   $ 3.4 $ 3.4 $ 0.0
The results of operations for DSI:        
Revenue of Acquiree since Acquisition Date   42.6    
Earnings or Loss of Acquiree since Acquisition Date   1.8    
Busniess combination purchase accounting inventory fair value step up amortization   3.8    
Intangible asset amortization expense   4.0    
Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]        
Purchase price adjustments, decrease to other long term liabilities     (1.6)  
Purchase price adjustments, increase to deferred tax liabilities     4.5  
Purchase price adjustments, increase in net working capital     0.6  
Goodwill Purchase Accounting Adjustments     $ 3.1  
Data Sciences International, Inc. (DSI) [Member]        
Business Acquisition [Line Items]        
Finite-Lived Intangible Assets, Weighted Average Useful Life     9 years 3 months 18 days  
The results of operations for DSI:        
Additional depreciation related to step up of fair value, PPE     $ 0.6  
Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract]        
Increase, Property, Plant, and Equipment     1.5  
Increase, Accounts Payable and Accrued Liabiities   $ 0.6 $ 0.6  
Trade Names [Member]        
Business Acquisition [Line Items]        
Finite-Lived Intangible Assets, Weighted Average Useful Life     7 years 8 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     7 years 1 month 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 7 months 6 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     7 years 3 months 18 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