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Productivity Improvement And Restructuring Initiatives (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 159.1 $ 152.4 $ 97.5
Severance costs 78.0 111.0 81.0
Other restructuring costs 81.0 30.0 17.0
Cash charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 103.0 140.0 94.0
Noncash charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 56.0 12.0 4.0
Operating segments | Dental      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 35.8 34.3 25.3
Operating segments | Dental | Trade names      
Restructuring Cost and Reserve [Line Items]      
Impairment of trade name   11.0  
Operating segments | Diagnostics      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 85.4 $ 62.2 $ 33.6
Operating segments | All segments excluding molecular diagnostic product line      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 83.0    
Molecular diagnostic product line | Operating segments | Diagnostics      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges 76.0    
Restructuring charges, after-tax $ 51.0    
Restructuring charges, after-tax, per diluted share $ 0.07    
Molecular diagnostic product line | Operating segments | Diagnostics | Cash charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 27.0    
Molecular diagnostic product line | Operating segments | Diagnostics | Noncash charges      
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ 49.0