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Investments (Fair Value Realized and Unrealized Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	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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