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LEASES - Narrative (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Weighted-average remaining lease term of operating leases 10 years 1 month 6 days 10 years 1 month 6 days
Weighted-average discount rate of operating leases (as a percent) 5.00% 5.00%
Operating lease costs $ 14.1 $ 29.8
Variable lease costs 2.6 5.0
Cash paid for amounts included in the measurement of operating lease liabilities   26.1
Operating lease liabilities arising from obtaining new or modified right-of-use assets   4.0
Selling, General and Administrative Expenses    
Lessee, Lease, Description [Line Items]    
Operating lease costs 12.9 27.4
Cost of Services    
Lessee, Lease, Description [Line Items]    
Operating lease costs $ 1.2 $ 2.4