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LEASES - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 18, 2019
Lessee, Lease, Description [Line Items]      
Weighted-average remaining lease term of operating leases 7 years 6 months 7 years 6 months  
Weighted-average remaining lease term of finance leases 5 years 4 months 24 days 5 years 4 months 24 days  
Weighted-average discount rate of operating leases (as a percent) 4.10% 4.10%  
Weighted-average discount rate of finance leases (as a percent) 2.80% 2.80%  
Operating lease costs $ 23.4 $ 53.3  
Variable lease costs 9.0 14.0  
Cash paid for amounts included in the measurement of operating lease liabilities   43.0  
Operating lease liabilities arising from obtaining new or modified right-of-use assets   23.5  
Operating lease liabilities acquired     $ 256.6
Finance lease liabilities acquired     $ 271.9
Selling, General and Administrative Expenses      
Lessee, Lease, Description [Line Items]      
Operating lease costs 20.4 47.9  
Cost of Services      
Lessee, Lease, Description [Line Items]      
Operating lease costs $ 3.0 $ 5.4