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LEASES - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Lessee, Lease, Description [Line Items]      
Weighted-average remaining lease term of operating leases 8 years 9 months 18 days 8 years 4 months 24 days  
Weighted-average remaining lease term of finance leases 2 years 8 months 12 days 3 years 2 months 12 days  
Weighted-average discount rate of operating leases (as a percent) 3.30% 3.20%  
Weighted-average discount rate of finance leases (as a percent) 3.40% 3.20%  
Operating lease cost $ 137.8 $ 195.6 $ 147.0
Variable lease cost 21.0 18.1 17.9
Finance lease cost 18.1 20.5 16.3
Amortization of right-of-use assets on finance leases 16.7 18.4 14.6
Interest on finance lease liabilities 1.4 2.2 1.6
Impairment charge to operating lease right-of-use assets 22.9 42.1  
Cash paid for amounts included in the measurement of operating lease liabilities 120.7 123.6 117.7
Operating lease liabilities arising from obtaining new or modified right-of-use assets 25.8 200.1 158.6
Cash paid for amounts included in the measurement of finance lease liabilities 21.2 22.6 11.2
Finance lease liabilities arising from obtaining new or modified right-of-use assets 8.2 7.9 51.3
Right-of-use assets acquired   8.8  
Lease liabilities assumed   5.8  
Operating lease, right-of-use asset termination 44.2    
Operating lease, lease liability termination 9.7    
Selling, General and Administrative Expenses      
Lessee, Lease, Description [Line Items]      
Operating lease cost 105.7 157.4 108.4
Cost of Services      
Lessee, Lease, Description [Line Items]      
Operating lease cost $ 32.1 $ 38.2 $ 38.6