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BENEFIT PLANS - RECONCILIATION FOR THE PLAN ASSETS CATEGORIZED AS LEVEL 3 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Change in Plan Assets. Level 3 [Roll Forward]    
Fair value of plan assets at beginning of year $ 173.1 $ 185.7
Actual return on plan assets:    
Effect of exchange rate changes 1.9 (2.4)
Fair value of plan assets at end of year 185.1 173.1
Level 3    
Change in Plan Assets. Level 3 [Roll Forward]    
Fair value of plan assets at beginning of year 35.1 36.4
Actual return on plan assets:    
Relating to assets still held at the reporting date 2.4 (1.7)
Purchases, sales and settlements, net 2.3 1.8
Effect of exchange rate changes (0.4) (1.4)
Fair value of plan assets at end of year 39.4 35.1
Level 3 | Insurance contracts    
Change in Plan Assets. Level 3 [Roll Forward]    
Fair value of plan assets at beginning of year 27.7 29.0
Actual return on plan assets:    
Relating to assets still held at the reporting date 3.7 (1.1)
Purchases, sales and settlements, net (0.6) 1.1
Effect of exchange rate changes (0.6) (1.3)
Fair value of plan assets at end of year 30.2 27.7
Level 3 | Hedge funds    
Change in Plan Assets. Level 3 [Roll Forward]    
Fair value of plan assets at beginning of year 7.1 7.1
Actual return on plan assets:    
Relating to assets still held at the reporting date (1.3) (0.6)
Purchases, sales and settlements, net 2.9 0.7
Effect of exchange rate changes 0.2 (0.1)
Fair value of plan assets at end of year 8.9 7.1
Level 3 | Real estate    
Change in Plan Assets. Level 3 [Roll Forward]    
Fair value of plan assets at beginning of year 0.3 0.3
Actual return on plan assets:    
Relating to assets still held at the reporting date 0.0 0.0
Purchases, sales and settlements, net 0.0 0.0
Effect of exchange rate changes 0.0 0.0
Fair value of plan assets at end of year $ 0.3 $ 0.3