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LEASES - Narrative (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Weighted-average remaining lease term of operating leases 10 years 2 months
Weighted-average discount rate of operating leases (as a percent) 5.20%
Operating lease costs $ 15.7
Variable lease costs 2.4
Cash paid for amounts included in the measurement of operating lease liabilities 12.5
Operating lease liabilities arising from obtaining new or modified right-of-use assets 1.5
Selling, General and Administrative Expenses  
Lessee, Lease, Description [Line Items]  
Operating lease costs 14.5
Cost of Services  
Lessee, Lease, Description [Line Items]  
Operating lease costs $ 1.2