Accounts Payable and Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accounts payable	$ 147.4	$ 134.6
Accrued expenses and other current liabilities	51.3	75.2
Accrued interconnection costs	69.6	43.5
Accrued payroll and employee benefits	35.1	39.6
Accrued interest	24.7	11.3
Accrued income taxes	6.3	2.0
Total accounts payable and other current liabilities	$ 334.4	$ 306.2