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Quarterly report pursuant to Section 13 or 15(d)

Investments In Available-For-Sale Securities And Other Cost Investments (Details)

v3.7.0.1
Investments In Available-For-Sale Securities And Other Cost Investments (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 09, 2017
Sep. 07, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý $ 750.0 Ìý Ìý $ 1,309.0
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Ìý Ìý 0.0 Ìý Ìý 0.0
Payments to Acquire Investments Ìý Ìý 442.0 $ 11.0 Ìý Ìý
Formula 1 Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Payments to Acquire Investments Ìý $ 746.0 Ìý Ìý Ìý Ìý
Liberty Sirius XM Group Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý 173.0 Ìý Ìý Ìý
Payments to Acquire Investments Ìý Ìý 434.0 Ìý Ìý Ìý
Liberty Sirius XM Group | Pandora Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Payments to Acquire Investments $ 172.5 Ìý Ìý Ìý Ìý Ìý
Liberty Sirius XM Group | Pandora | Fair Value Option Securities Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý 173.0 Ìý Ìý Ìý
Liberty Sirius XM Group | Pandora | Forecast Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Payments to Acquire Investments Ìý Ìý Ìý Ìý $ 480.0 Ìý
Ownership Interest In Investee Ìý Ìý Ìý Ìý 19.00% Ìý
Ownership percentage on an as-converted basis Ìý Ìý Ìý Ìý 16.00% Ìý
Braves Group Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý 8.0 Ìý Ìý 8.0
Payments to Acquire Investments Ìý Ìý 2.0 8.0 Ìý Ìý
Braves Group | AFS and cost method investments Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý 8.0 Ìý Ìý 8.0
Formula One Group Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý 569.0 Ìý Ìý 1,301.0
Payments to Acquire Investments Ìý Ìý 6.0 $ 3.0 Ìý Ìý
Formula One Group | Fair Value Option Securities Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý 508.0 Ìý Ìý 489.0
Formula One Group | AFS and cost method investments Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý 61.0 Ìý Ìý 812.0
Formula One Group | Other equity securities | Fair Value Option Securities Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý 19.0 Ìý Ìý 13.0
Formula One Group | Other AFS Equity Securities | AFS and cost method investments Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý 61.0 Ìý Ìý 53.0
Formula One Group | Time Warner Inc | Fair Value Option Securities Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý 427.0 Ìý Ìý 411.0
Formula One Group | Viacom, Inc. | Fair Value Option Securities Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý $ 62.0 Ìý Ìý 65.0
Formula One Group | Formula 1 | AFS and cost method investments Ìý Ìý Ìý Ìý Ìý Ìý
Transaction details [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investments in available-for-sale securities and other cost investments Ìý Ìý Ìý Ìý Ìý $ 759.0