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Accounts Payable and Other Current Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Accounts payable $ 134.6 $ 95.3
Accrued expenses and other current liabilities 75.2 45.1
Accrued interconnection costs 43.5 103.0
Accrued payroll and employee benefits 39.6 42.9
Accrued interest 11.3 8.8
Accrued income taxes 2.0 0.6
Total accounts payable and other current liabilities $ 306.2 $ 295.7