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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Carrying Amount | Publicly traded debt    
Liabilities:    
Long-term debt $ 8,265.2 $ 8,265.2
Carrying Amount | Non-publicly traded debt    
Liabilities:    
Long-term debt 25.7 26.8
Fair Value | Publicly traded debt    
Liabilities:    
Long-term debt 8,912.0 9,707.0
Fair Value | Non-publicly traded debt    
Liabilities:    
Long-term debt 25.2 26.5
Fair Value Measurements on a Recurring Basis | Fair Value    
Assets:    
Total assets, fair value 159.3 230.7
Liabilities:    
Deferred compensation plan liabilities 95.0 92.2
Net investment hedge liability 55.2 85.8
Total liabilities, fair value 150.2 178.0
Fair Value Measurements on a Recurring Basis | Fair Value | Deferred compensation plan assets    
Assets:    
Plan assets 72.2 69.2
Fair Value Measurements on a Recurring Basis | Fair Value | Qualified Replacement Plan assets    
Assets:    
Plan assets 87.1 161.5
Fair Value Measurements on a Recurring Basis | Level 1    
Assets:    
Total assets, fair value 126.5 199.4
Liabilities:    
Deferred compensation plan liabilities 95.0 92.2
Total liabilities, fair value 95.0 92.2
Fair Value Measurements on a Recurring Basis | Level 1 | Deferred compensation plan assets    
Assets:    
Plan assets 39.4 37.9
Fair Value Measurements on a Recurring Basis | Level 1 | Qualified Replacement Plan assets    
Assets:    
Plan assets 87.1 161.5
Liabilities:    
Cost basis of investment funds 84.2 159.6
Fair Value Measurements on a Recurring Basis | Level 2    
Assets:    
Total assets, fair value 32.8 31.3
Liabilities:    
Net investment hedge liability 55.2 85.8
Total liabilities, fair value 55.2 85.8
Fair Value Measurements on a Recurring Basis | Level 2 | Deferred compensation plan assets    
Assets:    
Plan assets 32.8 31.3
Fair Value Measurements on a Recurring Basis | Level 3    
Assets:    
Total assets, fair value 0.0 0.0
Liabilities:    
Total liabilities, fair value 0.0 0.0
Fair Value Measurements on a Recurring Basis | Level 1 and 2 | Deferred compensation plan assets    
Liabilities:    
Cost basis of investment funds $ 59.4 $ 58.1