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Investments (Fair Value Realized and Unrealized Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net Investment Income [Line Items]
Realized and unrealized gains (losses)	$ (93.6)	$ 194.6
ITV
Net Investment Income [Line Items]
Realized and unrealized gains (losses)	(167.4)	79.8
Pax8
Net Investment Income [Line Items]
Realized and unrealized gains (losses)	79.3	0.0
Skillz Inc. (Skillz)
Net Investment Income [Line Items]
Realized and unrealized gains (losses)	(26.1)	0.0
EdgeConneX Inc. (EdgeConneX)
Net Investment Income [Line Items]
Realized and unrealized gains (losses)	13.5	13.1
Lions Gate Entertainment Corp (Lionsgate)
Net Investment Income [Line Items]
Realized and unrealized gains (losses)	(2.5)	20.8
Plume Design, Inc. (Plume)
Net Investment Income [Line Items]
Realized and unrealized gains (losses)	0.0	55.1
Other
Net Investment Income [Line Items]
Realized and unrealized gains (losses)	$ 9.6	$ 25.8

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