Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Telecommunications services	$ 1,727,800,000	$ 1,490,800,000	$ 827,900,000
Operating expenses:
Cost of telecommunications services	941,900,000	819,400,000	432,100,000
Selling, general and administrative expenses	400,800,000	383,200,000	215,400,000
Severance, restructuring and other exit costs	13,000,000.0	37,100,000	22,400,000
Depreciation and amortization	248,800,000	211,400,000	132,600,000
Total operating expenses	1,604,500,000	1,451,100,000	802,500,000
Operating income	123,300,000	39,700,000	25,400,000
Other expense:
Interest expense, net	(194,700,000)	(146,900,000)	(71,200,000)
Loss on debt extinguishment	0	(13,800,000)	(8,600,000)
Other (expense) income, net	(31,300,000)	(127,900,000)	200,000
Total other expense	(226,000,000.0)	(288,600,000)	(79,600,000)
Loss before income taxes	(102,700,000)	(248,900,000)	(54,200,000)
Provision for (benefit from) income taxes	3,200,000	(5,500,000)	17,300,000
Net loss	$ (105,900,000)	$ (243,400,000)	$ (71,500,000)
Loss per share:
Basic (in dollars per share)	$ (1.88)	$ (4.80)	$ (1.71)
Diluted (in dollars per share)	$ (1.88)	$ (4.80)	$ (1.71)
Weighted average shares:
Basic (in shares)	56,265,166	50,718,279	41,912,952
Diluted (in shares)	56,265,166	50,718,279	41,912,952