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PENSION AND POSTRETIREMENT PLANS Defined Contribution Plans (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]        
Non Elective Contribution 3.00%      
Defined Contribution Plan, Cost $ 13.7 $ 17.3 $ 50.7 $ 49.1
Discretionary Contribution Percentage Maximum 3.00%      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 4.50%      
chiltern [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Discretionary Contribution Percentage Maximum 3.00%      
Covance [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Contribution Plan, Cost $ 18.2 $ 16.3 $ 56.0 $ 51.6