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Equity (Share Repurchases Programs) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 13, 2020
Class of Stock [Line Items] |  |  |  |
Distributable reserves recognized |  | $ 20,700.0 |  |
Stock repurchase, remaining authorized amount | $ 66.4 |  |  |
Remaining authorized for share repurchases | $ 2,700.0 |  |  |
Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Average price paid per share pursuant to repurchase programs (in dollars per shares) | $ 27.50 |  |  |
Shares repurchased (in shares) | 24,002,262 |  |  |
Class C |  |  |  |
Class of Stock [Line Items] |  |  |  |
Average price paid per share pursuant to repurchase programs (in dollars per shares) | $ 27.00 |  |  |
Shares repurchased (in shares) | 75,420,009 |  |  |
Liberty Global Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Total cost for stock purchased pursuant to repurchase programs | $ 3,220.2 | $ 2,010.0 | $ 2,894.7 |
Liberty Global Shares | Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares purchased pursuant to repurchase programs (in shares) | 24,348,562 | 15,649,900 | 34,881,510 |
Average price paid per share pursuant to repurchase programs (in dollars per shares) | $ 27.61 | $ 29.67 | $ 33.73 |
Liberty Global Shares | Class C |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares purchased pursuant to repurchase programs (in shares) | 95,395,291 | 54,211,059 | 52,523,651 |
Average price paid per share pursuant to repurchase programs (in dollars per shares) | $ 26.64 | $ 28.51 | $ 32.71 |
LiLAC Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Total cost for stock purchased pursuant to repurchase programs |  |  | $ 53.5 |
LiLAC Shares | Class A |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares purchased pursuant to repurchase programs (in shares) |  |  | 2,062,233 |
Average price paid per share pursuant to repurchase programs (in dollars per shares) |  |  | $ 22.84 |
LiLAC Shares | Class C |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares purchased pursuant to repurchase programs (in shares) |  |  | 285,572 |
Average price paid per share pursuant to repurchase programs (in dollars per shares) |  |  | $ 22.25 |
Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Additional repurchase of shares (in shares) |  |  |  | 1,000,000,000.0

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