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Investments (Schedule of Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Investments [Line Items] |  |
Equity | $ 3,367.7 | $ 3,488.7
Short-term, separately-managed accounts (SMAs) | 1,571.7 | 1,600.2
Long-term, SMAs | 389.5 | 365.7
Total investments | 3,629.0 | 3,466.0
Total investments (g) | 6,996.7 | 6,954.7
Short-term investments | 1,571.7 | 1,600.2
Long-term investments | 5,425.0 | 5,354.5
VodafoneZiggo JV |  |
Schedule of Investments [Line Items] |  |
Equity | $ 2,924.8 | 3,052.3
Ownership percentage | 50.00% |
All3Media Group (All3Media) |  |
Schedule of Investments [Line Items] |  |
Equity | $ 160.3 | 157.7
Ownership percentage | 50.00% |
Formula E Holdings Ltd (Formula E) |  |
Schedule of Investments [Line Items] |  |
Equity | $ 110.2 | 105.8
Ownership percentage | 32.90% |
Other |  |
Schedule of Investments [Line Items] |  |
Equity | $ 172.4 | 172.9
Long-term investments at fair value | 333.3 | 299.4
ITV |  |
Schedule of Investments [Line Items] |  |
Long-term investments at fair value | $ 660.8 | 581.0
Ownership percentage | 9.90% |
Skillz Inc. |  |
Schedule of Investments [Line Items] |  |
Long-term, SMAs | $ 198.3 | 225.4
Ownership percentage | 2.80% |
Plume Design, Inc. (Plume) |  |
Schedule of Investments [Line Items] |  |
Long-term, SMAs | $ 110.0 | 54.9
Ownership percentage | 12.10% |
Univision Holdings Inc. |  |
Schedule of Investments [Line Items] |  |
Long-term, SMAs | $ 100.0 | 100.0
Ownership percentage | 11.50% |
Lions Gate Entertainment Corp (Lionsgate) |  |
Schedule of Investments [Line Items] |  |
Long-term investments at fair value | $ 92.8 | 72.0
Ownership percentage | 3.00% |
CANAL+ Polska S.A. |  |
Schedule of Investments [Line Items] |  |
Long-term investments at fair value | $ 87.5 | 92.3
Ownership percentage | 17.00% |
EdgeConneX Inc. (EdgeConneX) |  |
Schedule of Investments [Line Items] |  |
Long-term investments at fair value | $ 85.1 | $ 75.1
Ownership percentage | 5.10% |

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