Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed expected tax benefit	$ 0.0	$ 0.0	$ 0.0
Permanent differences	(13.9)	(23.3)	(118.5)
Basis and other differences in the treatment of items associated with investments in Liberty Latin America entities	19.9	0.4	5.5
Increases in valuation allowances	(60.9)	(23.8)	(59.0)
International rate differences	56.0	130.3	116.4
Changes in uncertain tax positions	161.7	8.9	(54.9)
Enacted tax law and rate changes	11.3	1.5	83.7
Effect of non-deductible goodwill impairments	(43.8)	(157.0)	(101.9)
Other, net	(32.1)	11.9	(18.8)
Total income tax benefit (expense)	$ 98.2	$ (51.1)	$ (147.5)