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Investments (Narrative) (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |  |
Accrued interest | $ 6.2 |  | $ 7.1
Borrowings outstanding | 13,889.8 |  | 14,559.6
Revenue | 3,615.3 | $ 2,875.8 |
Proceeds from sale of debt securities | 1,500.0 | 1,200.0 |
Realized net losses | 1.3 | 1.3 |
Third-Party Purchaser |  |  |
Schedule of Investments [Line Items] |  |  |
Noncontrolling interests | 9.8 |  | 9.7
ITV Collar Loan |  |  |
Schedule of Investments [Line Items] |  |  |
Borrowings outstanding | $ 138.4 |  | 415.9
Shares held | 398.5 |  |
VodafoneZiggo JV |  |  |
Schedule of Investments [Line Items] |  |  |
Percent of interest income earned on loan included in investment | 100.00% |  |
Percent of remaining results of operations included in investment | 50.00% |  |
JV Services |  |  |
Schedule of Investments [Line Items] |  |  |
Revenue | $ 50.7 | $ 46.7 |
VodafoneZiggo JV Loan | VodafoneZiggo JV |  |  |
Schedule of Investments [Line Items] |  |  |
Excess of carrying amount over proportional share in investees net assets | $ 1,154.9 |  | 1,198.5
Related party note receivable rate | 5.55% |  |
Interest accrued | $ 13.4 |  |
VodafoneZiggo JV Receivable I | VodafoneZiggo JV |  |  |
Schedule of Investments [Line Items] |  |  |
Related party note receivable | 822.5 |  | 855.8
VodafoneZiggo JV Receivable II | VodafoneZiggo JV |  |  |
Schedule of Investments [Line Items] |  |  |
Related party note receivable | 122.1 |  | 127.1
Equity Method Investee | VodafoneZiggo JV |  |  |
Schedule of Investments [Line Items] |  |  |
Due from related party | 34.8 |  | $ 27.4
ITV Collar |  |  |
Schedule of Investments [Line Items] |  |  |
Derivative asset, fair value | $ 77.1 |  |

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