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OTHER DISCLOSURES. (Details) - USD ($)
 12 Months Ended
Jan. 01, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Expense recognized for defined contribution retirement plans   $ 117,000,000.0 $ 104,600,000 $ 105,600,000
Senior officers | Supplemental Savings Plan        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Deferral percentage of cash incentive compensation   50.00%    
Supplemental Savings Plan, minimum deferral period   2 years    
Supplemental Savings Plan, maximum deferral period   15 years    
Amount of cash incentive compensation senior officers elected to defer   $ 105,800,000 $ 107,500,000 $ 118,900,000
Maximum amount of cash incentive compensation senior officers elected to defer   $ 2,000,000    
Senior officers | Supplemental Savings Plan | Subsequent Event        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Supplemental Savings Plan, minimum deferral period 5 years      
Maximum | Senior officers | Supplemental Savings Plan        
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]        
Deferral percentage of cash incentive compensation   100.00%