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Investments (Fair Value Realized and Unrealized Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | $ 114.9 | $ (5.5)
EdgeConneX |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | 71.8 | 11.9
Lacework |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | (67.6) | (21.4)
ITV |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | 50.0 | 45.1
Vodafone |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | 48.2 | (37.4)
SMAs |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | 19.3 | (14.5)
Aviatrix Systems, Inc. (Aviatrix) |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | (14.3) | 0.0
Lionsgate |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | (6.0) | 34.1
Plume |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | (1.1) | (17.5)
Other, net |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | $ 14.6 | $ (5.8)

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