Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES (Additional Information) (Details)

v3.6.0.2
COMMITMENTS AND CONTINGENCIES (Additional Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Commitments and Contingencies Disclosure [Line Items]        
Rental expense for operating leases $ 29.1 $ 24.2 $ 22.6  
Cash paid for data processing, outsourcing services and other agreements $ 45.0 $ 50.0 $ 50.0  
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. 
     
Qualifying termination period, continuation of benefits for executives 3 years      
Change in control event, voting stock acquired (or more) 20.00%      
Change in control event, merger or business combination, common stock received (less than) 66.67%      
Qualifying termination period, continuation of benefits for executives, automatic renewal 3 years      
Potential percentage of stock acquired with change In control
any person acquires 20% or more of our voting stock
     
Conditional payment for unrecognized severance benefit for key executives $ 58.1      
Assumed tax on expected payment for unrecognized severance benefit for key executives $ 9.3      
Conditional payout percentage of target award 100.00%      
Maximum potential future payments required to make under guarantees $ 0.0      
Letter of Credit        
Commitments and Contingencies Disclosure [Line Items]        
Notional amount $ 0.0      
Minimum        
Commitments and Contingencies Disclosure [Line Items]        
Benefit continuation period 2 years      
Maximum        
Commitments and Contingencies Disclosure [Line Items]        
Benefit continuation period 3 years      
Data Processing, Outsourcing Services And Other Agreements | Minimum        
Commitments and Contingencies Disclosure [Line Items]        
Data processing, outsourcing services and other agreements, expiration year 2017      
Data processing, outsourcing services and other agreements, estimated aggregate contractual obligation $ 105.0      
Non cancelable contractual obligations within any annual period $ 75.0      
Data Processing, Outsourcing Services And Other Agreements | Maximum        
Commitments and Contingencies Disclosure [Line Items]        
Data processing, outsourcing services and other agreements, expiration year 2021      
IBM Operations Support Services Agreement        
Commitments and Contingencies Disclosure [Line Items]        
Service agreements expiration date       Dec. 31, 2016
Expected future year's minimum contractual obligation $ 25.0      
Expected future year's minimum contractual obligation within any annual period 20.0      
Performance Bonds        
Commitments and Contingencies Disclosure [Line Items]        
Notional amount $ 0.0