CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]              
Revenue $ 2,949.1 $ 2,929.7 $ 3,015.6 $ 3,063.5 $ 11,541.5 $ 11,957.9 $ 11,276.4
Operating costs and expenses (exclusive of depreciation and amortization, shown separately below):              
Programming and other direct costs of services         3,238.7 3,246.1 2,973.6
Other operating (note 15)         1,641.3 1,717.2 1,659.5
Selling, general and administrative (SG&A) (note 15)         2,107.8 2,049.1 1,980.4
Depreciation and amortization (note 10)         3,652.2 3,858.2 3,790.6
Impairment, restructuring and other operating items, net (notes 5, 16 and 17)         156.0 248.2 79.9
Operating costs and expenses         10,796.0 11,118.8 10,484.0
Operating income 252.4 205.1 264.1 117.5 745.5 839.1 792.4
Non-operating income (expense):              
Interest expense         (1,385.9) (1,478.7) (1,416.1)
Realized and unrealized gains (losses) on derivative instruments, net (note 8)         (192.0) 1,125.8 (1,052.8)
Foreign currency transaction gains (losses), net         (94.8) 90.4 (181.5)
Realized and unrealized gains (losses) due to changes in fair values of certain investments and debt, net (notes 7, 9 and 11)         72.0 (384.5) 43.4
Losses on debt modification and extinguishment, net (note 11)         (216.7) (65.0) (252.2)
Share of results of affiliates, net (note 7)         (198.5) (8.7) (95.2)
Other income, net         114.4 43.4 50.9
Non-operating income (expense)         (1,901.5) (677.3) (2,903.5)
Earnings (loss) from continuing operations before income taxes         (1,156.0) 161.8 (2,111.1)
Income tax expense (note 13)         (253.0) (1,573.3) (238.9)
Loss from continuing operations (313.9) (399.4) 669.0 (1,367.2) (1,409.0) (1,411.5) (2,350.0)
Discontinued operations (note 6):              
Earnings (loss) from discontinued operations, net of taxes         730.3 1,163.4 (370.6)
Gain on disposal of discontinued operations, net of taxes         12,316.9 1,098.1 0.0
Net earnings (loss)         13,047.2 2,261.5 (370.6)
Net earnings (loss) 52.2 1,025.9 950.5 (1,178.6) 11,638.2 850.0 (2,720.6)
Net earnings attributable to noncontrolling interests 341.0 450.6 (632.9) 1,373.3 (116.8) (124.7) (57.5)
Net earnings (loss) attributable to Liberty Global shareholders $ 25.1 $ 974.1 $ 912.6 $ (1,186.5) $ 11,521.4 $ 725.3 $ (2,778.1)
Basic and diluted loss from continuing operations attributable to Liberty Global shareholders per share (note 3) (in dollars per share) $ (0.45) $ (0.57) $ 0.80 $ (1.70) $ (2.16) $ (1.97) $ (2.86)
Weighted average shares outstanding - basic and diluted (in shares)         705,794,546 778,675,957 847,894,601