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EQUITY (Details)
$ / shares in Units, $ in Millions
3 Months Ended 129 Months Ended
Sep. 30, 2021
USD ($)
Vote / shares
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
Vote / shares
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Common Stock                
Common stock, shares authorized (in shares) 325,000,000           325,000,000 325,000,000
Common stock, par value (in dollars per share) | $ / shares $ 0.01           $ 0.01 $ 0.01
Common stock, shares issued (in shares) 126,226,121           126,226,121 125,998,967
Common stock, shares outstanding (in shares) 106,642,977           106,642,977 107,299,933
Common stock, votes per share | Vote / shares 1           1  
Common Stock in Treasury, at Cost                
Common stock held in Treasury (in shares) 19,583,144           19,583,144 18,699,034
Share Repurchase Program                
Number of shares of common stock repurchased       465,366     18,072,129  
Average price paid per share | $ / shares       $ 89.92     $ 68.12  
Total purchase price | $   $ 33.7 $ 47.6 $ 41.8 $ 99.8 $ 119.5 $ 1,200.0  
Availability remaining under existing share repurchase authorizations | $ $ 318.9     $ 288.1     $ 318.9  
Purchase of Common Stock from Employees                
Stock repurchased from employee stock plans (in shares) 1,462     786        
Average price paid per share (in dollars per share) | $ / shares $ 124.14     $ 100.62        
Preferred stock                
Preferred stock, shares authorized (in shares) 20,000,000           20,000,000 20,000,000
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01           $ 0.01 $ 0.01
Preferred stock, shares issued (in shares) 0           0 0
Preferred stock, shares outstanding (in shares) 0           0 0
Dividends                
Cash dividends declared (in dollars per share) | $ / shares $ 0.48 $ 0.42 $ 0.42 0.42 $ 0.36 $ 0.36    
Cash dividends paid (in dollars per share) | $ / shares $ 0.48     $ 0.42        
Aggregate payout | $ $ 51.5 $ 45.0 $ 45.3 $ 45.8 $ 39.5 $ 40.0