Accumulated Other Comprehensive Earnings (Statements of Comprehensive Earnings (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), pre-tax amount	$ 209.4	$ 2,577.4	$ 476.6
Other comprehensive income (loss), tax benefit (expense)	(9.1)	3.6	5.5
Other comprehensive earnings (loss)	200.3	2,581.0	482.1
Other comprehensive earnings attributable to noncontrolling interests, Pre-tax amount	(1.6)	(0.9)	(1.5)
Other comprehensive earnings attributable to noncontrolling interests, Tax benefit (expense)	0.4	0.3	0.3
Other comprehensive earnings (loss) attributable to noncontrolling interests, net	(1.2)	(0.6)	(1.2)
Other comprehensive earnings (loss) attributable to Liberty Latin America shareholders, pre-tax	207.8	2,576.5	475.1
Other comprehensive earnings (loss) attributable to Liberty Latin America shareholders, tax	(8.7)	3.9	5.8
Other comprehensive earnings (loss) attributable to Liberty Latin America shareholders, net	199.1	2,580.4	480.9
Continuing Operations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), pre-tax amount	269.3	2,563.9	425.0
Other comprehensive income (loss), tax benefit (expense)	(9.1)	3.6	5.6
Other comprehensive earnings (loss)	260.2	2,567.5	430.6
Discontinued Operations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), pre-tax amount	(59.9)	13.5	51.6
Other comprehensive income (loss), tax benefit (expense)	0.0	0.0	(0.1)
Other comprehensive earnings (loss)	(59.9)	13.5	51.5
Foreign currency translation adjustments (a)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), pre-tax amount	129.4	2,586.4	441.7
Other comprehensive income (loss), tax benefit (expense)	1.2	(0.2)	3.3
Other comprehensive earnings (loss)	130.6	2,586.2	445.0
Pension-related adjustments and other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), pre-tax amount	139.9	(22.5)	(16.7)
Other comprehensive income (loss), tax benefit (expense)	(10.3)	3.8	2.3
Other comprehensive earnings (loss)	$ 129.6	$ (18.7)	$ (14.4)