Investments (Fair Value Realized and Unrealized gain Losses) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Net Investment Income [Line Items] | ||||
| Total | $ 155.4 | $ 55.3 | $ 213.2 | $ 111.1 |
| EdgeConneX | ||||
| Net Investment Income [Line Items] | ||||
| Total | 95.3 | 14.9 | 154.2 | 3.6 |
| Lionsgate | ||||
| Net Investment Income [Line Items] | ||||
| Total | 40.4 | (9.5) | 43.6 | (7.3) |
| Televisa Univision | ||||
| Net Investment Income [Line Items] | ||||
| Total | 2.8 | (27.6) | 7.8 | (41.6) |
| Plume | ||||
| Net Investment Income [Line Items] | ||||
| Total | (5.6) | (9.7) | (6.8) | (13.0) |
| ITV | ||||
| Net Investment Income [Line Items] | ||||
| Total | 7.3 | 43.1 | (6.1) | 79.8 |
| Vodafone | ||||
| Net Investment Income [Line Items] | ||||
| Total | 0.0 | 57.9 | 0.0 | 121.6 |
| Other, net | ||||
| Net Investment Income [Line Items] | ||||
| Total | $ 15.2 | $ (13.8) | $ 20.5 | $ (32.0) |