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CAPITAL STOCK - Additional Information - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Equity, Class of Treasury Stock [Line Items]      
Repurchase of shares of common stock   1.7 0.5
Aggregate cost of repurchase $ 0.2    
Number of shares repurchased under settlement of employee tax withholding obligations     0.2
Shares repurchased aggregate value under settlement of employee tax withholding obligations   $ 10.7 $ 9.6
2006 Share Repurchase Program [Member]      
Equity, Class of Treasury Stock [Line Items]      
Share repurchase program 1,000.0 $ 1,000.0  
Repurchase of shares of common stock   1.4  
Aggregate cost of repurchase   $ 61.9 $ 28.7
2019 Share Repurchase Program [Member]      
Equity, Class of Treasury Stock [Line Items]      
Share repurchase program $ 500.0 500.0  
Share Repurchase Program [Member]      
Equity, Class of Treasury Stock [Line Items]      
Aggregate cost of repurchase   $ 73.2