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Investments - Investments in Equity Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Equity Securities
Beginning balance	$ 91.2	$ 96.5
New investments	13.1	8.7
(Decrease) increase in fair value of investments in equity securities	10.7	(14.4)
Foreign currency translation adjustments and other	(0.4)	0.4
Ending balance	114.6	91.2
Investment in Equity Securities, Level 1
Equity Securities
Beginning balance	4.8	17.2
New investments	0.0	0.0
(Decrease) increase in fair value of investments in equity securities	(3.1)	(12.7)
Foreign currency translation adjustments and other	(0.2)	0.3
Ending balance	1.5	4.8
Investment in Equity Securities, Level 2
Equity Securities
Beginning balance	6.1	7.8
New investments	0.0	0.0
(Decrease) increase in fair value of investments in equity securities	1.8	(1.7)
Foreign currency translation adjustments and other	0.0	0.0
Ending balance	7.9	6.1
Investments in Equity Securities, All Others
Equity Securities
Beginning balance	80.3	71.5
New investments	13.1	8.7
(Decrease) increase in fair value of investments in equity securities	12.0	0.0
Foreign currency translation adjustments and other	(0.2)	0.1
Ending balance	$ 105.2	$ 80.3

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