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SIGNIFICANT ACCOUNTING POLICIES - Disposition (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2020
Apr. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Transactions            
Debt instrument, term         30 years  
Ten year 2020 senior notes            
Debt Transactions            
Aggregate principal amount     $ 750.0      
Interest rate (as a percent)     4.80%      
Effective interest rate (as a percent)     4.58%      
Debt instrument, term     10 years      
364-day Revolving Credit Agreement            
Debt Transactions            
Maximum borrowing capacity under the credit agreement   $ 500.0        
Debt instrument, term   364 days        
April 2020 Term Credit Agreement            
Debt Transactions            
Maximum borrowing capacity under the credit agreement   $ 305.0        
Ten year August 2020 senior notes            
Debt Transactions            
Aggregate principal amount $ 600.0          
Interest rate (as a percent) 1.30%          
Debt instrument, term 10 years          
Thirty year August 2020 senior notes            
Debt Transactions            
Aggregate principal amount $ 500.0          
Interest rate (as a percent) 2.125%          
Debt instrument, term 30 years          
Series B private placement senior notes due 2023            
Debt Transactions            
Aggregate principal amount         $ 250.0 $ 250.0
Interest rate (as a percent) 4.32%          
Effective interest rate (as a percent)         4.36% 4.36%
Ten year 2011 senior notes            
Debt Transactions            
Aggregate principal amount         $ 1,020.0  
Interest rate (as a percent) 4.35%          
Effective interest rate (as a percent)         4.43% 4.43%
Debt instrument, term         10 years  
Holchem Group Limited [Member] | Subsequent event            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Total Consideration       $ 106.6    
Proceeds from Divestiture of Businesses       55.4    
Disposal Group Including Discontinued Operation, Consideration, Notes Receivable       51.2    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal After Tax       16.3    
Disposal Group, Including Discontinued Operation, Revenue       $ 55.0