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EMPLOYEE BENEFIT PLANS - Defined Contribution Plans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Contribution Plans      
Matching contributions relating to entity's employees $ 26.6 $ 19.9 $ 17.3
United States defined contribution plan      
Defined Contribution Plans      
Maximum contributions of a participant's eligible compensation (as a percent) 25.00%    
Dollar-for-dollar match of employee's annual eligible compensation (as a percent) 4.00%    
Company match of eligible compensation after dollar-for-dollar basis (as a percent) 2.00%    
Company match, second level (as a percent) 50.00%    
Puerto Rico defined contribution plan      
Defined Contribution Plans      
Maximum contributions of a participant's eligible compensation (as a percent) 25.00%    
Dollar-for-dollar match of employee's annual eligible compensation (as a percent) 4.00%    
Company match, first level (as a percent) 50.00%    
Profit sharing contribution calculated on eligible earnings (as a percent) 2.00%    
Nonqualified deferred compensation plans      
Defined Contribution Plans      
Amount accrued under nonqualified plans $ 68.5 $ 64.1