Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Other Intangible Assets (Narrative) (Details)

v3.3.1.900
Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Intangible Assets [Line Items]            
Impairment charges of definite-life intangibles assets $ 0.0 $ 183.4        
Impairment charges       $ 18.2 $ 3.0  
Amortization of intangible assets       $ 75.0 81.9 $ 61.3
Minimum [Member] | Definite-life intangible assets [Member]            
Other Intangible Assets [Line Items]            
Discount rate (as a percent)       0.00%    
Growth rate (as a percent)       0.00%    
Maximum [Member] | Definite-life intangible assets [Member]            
Other Intangible Assets [Line Items]            
Discount rate (as a percent)       0.00%    
Growth rate (as a percent)       0.00%    
MakerBot [Member]            
Other Intangible Assets [Line Items]            
Impairment charges of definite-life intangibles assets     $ 43.2 $ 108.7 $ 11.6  
Discount rate (as a percent)         13.50%  
Growth rate (as a percent)         3.50%  
Expected cash flow period         5 years  
Developed Technology [Member]            
Other Intangible Assets [Line Items]            
Impairment charges of definite-life intangibles assets 0.0 151.0     $ 11.6  
Developed Technology [Member] | MakerBot [Member]            
Other Intangible Assets [Line Items]            
Impairment charges of definite-life intangibles assets     29.8      
Customer relationships, trade names and non-compete agreements [Member]            
Other Intangible Assets [Line Items]            
Impairment charges of definite-life intangibles assets 0.0 32.4        
Customer relationships, trade names and non-compete agreements [Member] | MakerBot [Member]            
Other Intangible Assets [Line Items]            
Impairment charges of definite-life intangibles assets     $ 13.4      
In-process Research and Development [Member]            
Other Intangible Assets [Line Items]            
Impairment charges 8.4 $ 9.8     $ 3.0  
Customer relationships, trade names, non-compete agreements and capitalized software development costs [Member]            
Other Intangible Assets [Line Items]            
Impairment charges of definite-life intangibles assets $ 23.0