Condensed Consolidated Statements of Comprehensive Earnings (Loss) (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ (652.4)	$ 109.1	$ (919.6)	$ (263.6)
Other comprehensive earnings (loss), net of taxes:
Foreign currency translation adjustments	868.2	(1,010.8)	1,110.9	(994.2)
Pension-related adjustments and other	2.3	(1.6)	(0.5)	(5.2)
Other comprehensive earnings (loss)	870.5	(1,012.4)	1,110.4	(999.4)
Comprehensive earnings (loss)	218.1	(903.3)	190.8	(1,263.0)
Comprehensive earnings attributable to noncontrolling interests	(22.0)	(7.1)	(74.5)	(3.5)
Comprehensive earnings (loss) attributable to Liberty Global shareholders	$ 196.1	$ (910.4)	$ 116.3	$ (1,266.5)