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COMMITMENTS, CONTINGENCIES AND REGULATORY MATTERS - Leases (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Lessee, Lease, Description [Line Items]      
Right-to-use assets     $ 42.1
Lease obligation liabilities     $ 45.5
Sublease income $ 0.4 $ 0.5  
Minimum      
Lessee, Lease, Description [Line Items]      
Lease term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Lease term 6 years