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Investments - Investments in Equity Securities (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Equity Securities
Balance at December 31, 2023	$ 91.2
New investments	13.1
(Decrease) increase in fair value of investments in equity securities	(2.0)
Foreign currency translation adjustments and other	(0.3)
Balance at June 30, 2024	102.0
Investment in Equity Securities, Level 1
Equity Securities
Balance at December 31, 2023	4.8
New investments	0.0
(Decrease) increase in fair value of investments in equity securities	(1.8)
Foreign currency translation adjustments and other	(0.1)
Balance at June 30, 2024	2.9
Investment in Equity Securities, Level 2
Equity Securities
Balance at December 31, 2023	6.1
New investments	0.0
(Decrease) increase in fair value of investments in equity securities	(0.4)
Foreign currency translation adjustments and other	0.0
Balance at June 30, 2024	5.7
Investments in Equity Securities, All Others
Equity Securities
Balance at December 31, 2023	80.3
New investments	13.1
(Decrease) increase in fair value of investments in equity securities	0.2
Foreign currency translation adjustments and other	(0.2)
Balance at June 30, 2024	$ 93.4

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