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Business Acquisitions (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
ITrade Network Acquisition [Member]
      
Fair value of assets acquired and liabilities assumed [Abstract]      
Current assets   $ 14,174,000  
Other assets   2,998,000  
Intangible assets   313,600,000  
Goodwill   335,971,000  
Total assets acquired   666,743,000  
Current liabilities   (15,301,000)  
Other liabilities   (128,841,000)  
Net assets acquired   522,601,000  
Business Acquisition, Effective Date of Acquisition   July 27, 2010  
Description of Acquired Entity  
a global provider of software as a service ("SaaS")-based trading network and business intelligence solutions
  
Name of Acquired Entity  
iTradeNetwork, Inc
  
Reason for Business Combination   The Company acquired iTrade in order to complement and expand existing software services at other Roper businesses  
Purchase Price Allocation Goodwill Amount   335,971,000  
Purchase Price Allocation Intangible Assets Amount   313,600,000  
Heartscape Acquisition [Member]
      
Fair value of assets acquired and liabilities assumed [Abstract]      
Business Acquisition, Effective Date of Acquisition   February 22, 2010  
Description of Acquired Entity  
a technology with the capability to improve the speed and accuracy of detecting heart attacks
  
Name of Acquired Entity  
Heartscape, Inc
  
Total Acquisitions [Member]
      
Fair value of assets acquired and liabilities assumed [Abstract]      
Intangible assets 91,000,000 320,000,000 126,000,000
Goodwill 149,000,000 345,000,000 246,000,000
Trade names that are not subject to amortization 3,000,000 35,000,000 27,000,000
Cost of Acquired Entity Purchase Price 234,000,000 538,000,000 353,000,000
Purchase Price Allocation Goodwill Amount 149,000,000 345,000,000 246,000,000
Purchase Price Allocation Intangible Assets Amount 91,000,000 320,000,000 126,000,000
Cost of Acquired Entity Transaction Costs 2,100,000 2,100,000 2,200,000
Business acquisitions completed during the period, number $ 3 $ 2,000,000  
NDI Holdings Corp Acquisition [Member]
      
Fair value of assets acquired and liabilities assumed [Abstract]      
Business Acquisition, Effective Date of Acquisition June 3, 2011    
Description of Acquired Entity
a provider of 3-D measurement technology for medical applications in computer-assisted surgery and computer-assisted therapy.
    
Name of Acquired Entity
NDI Holding Corp.
    
Reason for Business Combination
Roper acquired Northern Digital as an addition to its medical platform, and is reported in the Medical and Scientific Imaging segment
    
United Controls Group, Inc Acquisition [Member]
      
Fair value of assets acquired and liabilities assumed [Abstract]      
Business Acquisition, Effective Date of Acquisition September 26, 2011    
Description of Acquired Entity
a manufacturer of control systems in the oil and gas industry.
    
Name of Acquired Entity
United Controls Group, Inc
    
Reason for Business Combination
UCG was acquired as an addition to our existing process control systems businesses
    
Trinity Integrated Systems, Ltd Acquisition [Member]
      
Fair value of assets acquired and liabilities assumed [Abstract]      
Business Acquisition, Effective Date of Acquisition December 1, 2011    
Description of Acquired Entity
a specialist provider of requirements capture, safety lifecycle management and engineering software tools, and safety and control system solutions to the oil and gas, industrial process and control markets
    
Name of Acquired Entity
Trinity Integrated Systems Ltd.
    
Reason for Business Combination
Trinity was acquired as an addition to our existing process control systems businesses