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SHAREHOLDERS' EQUITY (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 12 Months Ended 20 Months Ended
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Oct. 07, 2019
Aug. 05, 2019
Apr. 26, 2018
Equity, Class of Treasury Stock [Line Items]                
Cost of common stock repurchased and retired   $ 145.9 $ 50.0 $ 0.0        
Stock options exercised (in shares)   0.1 0.2 1.7        
Total value of stock options exercised   $ 1.7 $ 3.4 $ 32.4        
Foreign currency translation adjustment [Roll Forward]                
Beginning balance $ 7.6 0.7 7.6 (24.1)        
Unrealized gains (losses)   (9.1) (22.2) 55.6        
Reclassification adjustments of (gains) losses into income   0.0 0.0 0.0        
Tax (provision) benefit   0.0 0.0 (23.9)        
Net change   (9.1) (22.2) 31.7        
Ending balance   (8.4) 0.7 7.6 $ (8.4)      
Unrealized gains (losses) on derivative contracts (net of taxes) [Roll Forward]                
Beginning balance 11.1 1.8 11.1 12.8        
Unrealized gains (losses)   (23.0) (1.1) 1.9        
Reclassification adjustments of (gains) losses into income   2.8 (14.3) (4.6)        
Tax (provision) benefit   4.8 3.7 1.0        
Net change   (15.4) (11.7) (1.7)        
Ending balance   (13.6) 1.8 11.1 (13.6)      
Pension and postretirement benefits (net of taxes) [Roll Forward]                
Beginning balance (503.3) (653.5) (503.3) (498.7)        
Unrealized gains (losses)   (183.9) (98.5) (27.3)        
Reclassification adjustments of (gains) losses into income   29.1 37.0 26.9        
Tax (provision) benefit   26.9 14.9 (4.2)        
Net change   (127.9) (46.6) (4.6)        
Ending balance   (781.4) (653.5) (503.3) (781.4)      
Accumulated other comprehensive loss [Roll Forward]                
Beginning balance (484.6) (651.0) (484.6) (510.0)        
Unrealized gains (losses)   (216.0) (121.8) 30.2        
Reclassification adjustments of (gains) losses into income   31.9 22.7 22.3        
Tax (provision) benefit   31.7 18.6 (27.1)        
Net change   (152.4) (80.5) 25.4        
Ending balance   $ (803.4) $ (651.0) $ (484.6) (803.4)      
Income Tax Reclassification Adjustment, Foreign Currency Translation 15.3              
Income Tax Reclassification Adjustment, Derivative Contracts 2.4              
Income Tax Reclassification Adjustment, Pension and Postretirement Benefits (103.6)              
Income Tax Accounting Standard Adoption $ (85.9)              
Common Stock | 2018 Share Repurchase Program                
Equity, Class of Treasury Stock [Line Items]                
Authorized share repurchase program (in dollars)               $ 500.0
Stock Repurchased and Retired During Period, Shares   8.0 2.1          
Cost of common stock repurchased and retired   $ 145.9 $ 50.0   $ 195.9      
Total repurchased shares under this program (in shares)         10.1      
Remaining authorized repurchase amount (in dollars)   $ 304.1     $ 304.1      
Accelerated Share Repurchase [Member] | Common Stock | 2018 Share Repurchase Program                
Equity, Class of Treasury Stock [Line Items]                
Accelerated Share Repurchase Contract Payment             $ 100.0  
Accelerated Share Repurchase Program Reduction to Authorized Repurchase Amount             $ 100.0  
Accelerated Share Repurchase Total Shares Repurchased           5.7