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Investments (Fair Value Realized and Unrealized Losses) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | $ 194.6 | $ (528.0)
ITV |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | 79.8 | (471.9)
Plume Design, Inc. (Plume) |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | 55.1 | 0.0
Lions Gate Entertainment Corp (Lionsgate) |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | 20.8 | (29.4)
EdgeConneX |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | 13.1 | 0.0
Other |  |
Net Investment Income [Line Items] |  |
Realized and unrealized gains (losses) | $ 25.8 | $ (26.7)

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