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Accounts Payable and Other Current Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Accounts payable $ 133.1 $ 104.7
Accrued expenses and other current liabilities 95.5 83.4
Accrued interconnection costs 64.1 103.0
Accrued payroll and employee benefits 35.1 44.2
Accrued interest 8.1 8.8
Accrued income taxes 2.6 0.8
Total accounts payable and other current liabilities $ 338.5 $ 344.9