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Customer Revenue by Classes of Similar Products or Services (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenue from External Customer [Line Items]        
Customer revenue $ 806.4 $ 858.6 $ 1,568.1 $ 1,668.5
Services
       
Revenue from External Customer [Line Items]        
Customer revenue 712.9 739.7 1,403.8 1,462.7
Technology
       
Revenue from External Customer [Line Items]        
Customer revenue 93.5 118.9 164.3 205.8
Systems Integration and Consulting | Services
       
Revenue from External Customer [Line Items]        
Customer revenue 216.4 234.7 427.4 446.5
Outsourcing | Services
       
Revenue from External Customer [Line Items]        
Customer revenue 362.0 354.7 703.5 716.0
Infrastructure Services | Services
       
Revenue from External Customer [Line Items]        
Customer revenue 89.0 105.5 181.8 210.6
Core Maintenance | Services
       
Revenue from External Customer [Line Items]        
Customer revenue 45.5 44.8 91.1 89.6
Enterprise-Class Software And Servers | Technology
       
Revenue from External Customer [Line Items]        
Customer revenue 90.8 112.2 153.4 192.2
Other Technology | Technology
       
Revenue from External Customer [Line Items]        
Customer revenue $ 2.7 $ 6.7 $ 10.9 $ 13.6