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OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period $ 9,993.6 $ 2,869.1
Other comprehensive income before reclassifications 40.6 (128.1)
Amounts reclassified from accumulated other comprehensive income 2.9 2.1
Net current-period other comprehensive income 43.5 (126.0)
Balance end of period 10,152.7 9,993.6
Foreign currency translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (308.6) (202.2)
Other comprehensive income before reclassifications 48.4 (106.4)
Amounts reclassified from accumulated other comprehensive income 0.0 0.0
Net current-period other comprehensive income 48.4 (106.4)
Balance end of period (260.2) (308.6)
Derivative contracts    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (3.3) (0.1)
Other comprehensive income before reclassifications 5.7 (3.2)
Amounts reclassified from accumulated other comprehensive income 0.0 0.0
Net current-period other comprehensive income 5.7 (3.2)
Balance end of period 2.4 (3.3)
Pension and post retirement benefit plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (70.7) (54.3)
Other comprehensive income before reclassifications (13.5) (18.5)
Amounts reclassified from accumulated other comprehensive income 2.9 2.1
Net current-period other comprehensive income (10.6) (16.4)
Balance end of period (81.3) (70.7)
Accumulated Other Comprehensive Loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (382.6) (256.6)
Balance end of period $ (339.1) $ (382.6)