Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES (Additional Information) (Detail)

v3.3.1.900
COMMITMENTS AND CONTINGENCIES (Additional Information) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Line Items]      
Rental expense for operating leases $ 24.2 $ 22.6 $ 24.2
Cash paid for data processing, outsourcing services and other agreements $ 50.0 $ 50.0 $ 60.0
Severance benefit term
In the event of a qualifying termination, the executive will become entitled to continuation of group health, dental, vision, life, disability, 401(k) and similar benefits for two or three years, depending on the eligibility, as well as a lump sum severance payment, all of which differs by executive. 
    
Potential Percentage Of Stock Acquired With Change In Control
any person acquires 20% or more of our voting stock
    
Qualifying termination, continuation of benefits for executives 3 years    
Qualifying termination, continuation of benefits for executives, automatic renewal 3 years    
Conditional payment for unrecognized severance benefit for key executives $ 54.7    
Assumed tax on expected payment for unrecognized severance benefit for key executives $ 30.8    
Conditional payout percentage of target award 100.00%    
Guarantees      
Commitments and Contingencies Disclosure [Line Items]      
Performance bonds and standby letters of credit remaining maturity date one year or less.    
Data Processing, Outsourcing Services And Other Agreements | Minimum      
Commitments and Contingencies Disclosure [Line Items]      
Service agreements expiration year 2016    
Estimated aggregate minimum contractual obligation $ 35.0    
Data Processing, Outsourcing Services And Other Agreements | Maximum      
Commitments and Contingencies Disclosure [Line Items]      
Service agreements expiration year 2023    
Estimated aggregate minimum contractual obligation $ 55.0    
IBM Operations Support Services Agreement      
Commitments and Contingencies Disclosure [Line Items]      
Service agreements expiration date     Dec. 31, 2016
IBM Operations Support Services Agreement | Minimum      
Commitments and Contingencies Disclosure [Line Items]      
Expected future year's minimum contractual obligation 20.0    
IBM Operations Support Services Agreement | Maximum      
Commitments and Contingencies Disclosure [Line Items]      
Expected future year's minimum contractual obligation $ 30.0