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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail)
$ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Customer
Sep. 30, 2017
USD ($)
Sep. 30, 2018
ARS ($)
Dec. 31, 2017
USD ($)
Significant Accounting Policies [Line Items]            
Net monetary assets $ 6,902.9   $ 6,902.9     $ 6,988.3
Deferred installation costs 1.8   5.0      
Selling, general and administrative expenses 267.2 $ 274.5 862.5 $ 1,102.7    
ASC 606            
Significant Accounting Policies [Line Items]            
Net increase to retained earnings 13.0   13.0      
ASC 606 | Difference between Revenue Guidance in Effect before and after Topic 606            
Significant Accounting Policies [Line Items]            
Capitalization of contract acquisition costs 22.9   22.9      
Deferred installation costs     4.9      
Deferred income taxes liabilities 5.0   5.0      
Selling, general and administrative expenses $ 1.3   7.6      
Argentina            
Significant Accounting Policies [Line Items]            
Cumulative inflation period 3 years          
Net monetary assets $ 10.5   10.5   $ 430  
Argentina | Other Expense, Net            
Significant Accounting Policies [Line Items]            
Foreign exchange loss $ 5.0   $ 5.0      
Minimum            
Significant Accounting Policies [Line Items]            
Number of customers | Customer     1,000,000      
Minimum | Argentina            
Significant Accounting Policies [Line Items]            
Cumulative inflation rate 100.00%