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LEASES - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 18, 2019
Lessee, Lease, Description [Line Items]        
Weighted-average remaining lease term of operating leases 7 years 4 months 24 days 7 years 4 months 24 days    
Weighted-average remaining lease term of finance leases 4 years 3 months 18 days 5 years 1 month 6 days    
Weighted-average discount rate of operating leases (as a percent) 3.50% 4.10%    
Weighted-average discount rate of finance leases (as a percent) 3.30% 2.80%    
Operating lease cost $ 147.0 $ 85.9    
Variable lease cost 17.9 19.1    
Finance lease cost 16.3      
Amortization of right-of-use assets on finance leases 14.6      
Interest on finance lease liabilities 1.6      
Cash paid for amounts included in the measurement of operating lease liabilities 117.7 70.4    
Operating lease liabilities arising from obtaining new or modified right-of-use assets 158.6 28.4    
Cash paid for amounts included in the measurement of finance lease liabilities 11.2      
Finance lease liabilities arising from obtaining new or modified right-of-use assets 51.3      
Right-of-use assets acquired       $ 256.2
Lease liabilities assumed       $ 272.0
Rent expense on operating leases     $ 47.1  
Selling, General and Administrative Expenses        
Lessee, Lease, Description [Line Items]        
Operating lease cost 108.4 71.0    
Cost of Services        
Lessee, Lease, Description [Line Items]        
Operating lease cost $ 38.6 $ 14.9