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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Lease Accounting (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
LEASE      
Adopt the land easement practical expedient true    
Lessee, Operating Lease, Existence of Option to Extend [true false] true    
Lessee, Finance Lease, Existence of Option to Extend [true false] true    
Finance lease right-of-use assets $ 25.3   $ 25.3
Depreciation 24.5 $ 37.2  
Asset Leased Under Operating Leases      
LEASE      
Depreciation 4.1 4.9  
Lease income $ 6.2 $ 5.4  
Maximum      
LEASE      
Operating lease, renewal terms 5 years    
Finance lease, renewal terms 5 years    
Maximum | Real estate      
LEASE      
Operating lease, initial terms 15 years    
Finance Lease, initial terms 15 years    
Maximum | Revenue equipment      
LEASE      
Finance Lease, initial terms 9 years    
Maximum | Asset Leased Under Operating Leases      
LEASE      
Terms 72 months    
Minimum      
LEASE      
Operating lease, renewal terms 1 year    
Finance lease, renewal terms 1 year    
Minimum | Real estate      
LEASE      
Operating lease, initial terms 3 years    
Minimum | Revenue equipment      
LEASE      
Operating lease, initial terms 3 years    
Finance Lease, initial terms 3 years    
Minimum | Asset Leased Under Operating Leases      
LEASE      
Terms 30 months