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Accounts Payable and Other Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Other Current Liabilities
Accounts payable and other current liabilities consist of the following (in millions):
 
 
December 31,
 
 
2018
 
2017
Accounts payable
 
$
104.7

 
$
119.2

Accrued interconnection costs
 
103.0

 
73.4

Accrued expenses and other current liabilities
 
83.4

 
99.5

Accrued payroll and employee benefits
 
44.2

 
44.4

Accrued interest
 
8.8

 
4.6

Accrued income taxes
 
0.8

 
6.4

Total accounts payable and other current liabilities
 
$
344.9

 
$
347.5