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INCOME TAX EXPENSE - Impact of U.S Tax reform (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 27, 2020
Jan. 01, 2018
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2017
Tax Reform          
Settlement or adjustment for prior periods     $ 49.9 $ (75.8)  
Income tax expense     $ 250.7 $ 439.8  
Applicable tax rate     26.50% 26.50%  
Federal Alternative Minimum Tax credits $ 33.1        
Additional federal tax refunds $ 73.7        
U.S Tax Reform          
Tax Reform          
Applicable tax rate         35.00%
Alternative Minimum Tax          
Tax Reform          
Income tax expense         $ 25.4
Applicable tax rate   21.00%