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Investments - Investments in Equity Securities (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Equity Securities
Balance at December 31, 2024	$ 114.6
New investments	1.4
(Decrease) increase in fair value of investments in equity securities	(2.3)
Foreign currency translation adjustments and other	4.2
Balance at September 30, 2025	117.9
Investment in Equity Securities, Level 1
Equity Securities
Balance at December 31, 2024	1.5
New investments	0.0
(Decrease) increase in fair value of investments in equity securities	(4.7)
Foreign currency translation adjustments and other	3.2
Balance at September 30, 2025	0.0
Investment in Equity Securities, Level 2
Equity Securities
Balance at December 31, 2024	7.9
New investments	0.0
(Decrease) increase in fair value of investments in equity securities	(1.5)
Foreign currency translation adjustments and other	0.0
Balance at September 30, 2025	6.4
Investments in Equity Securities, All Others
Equity Securities
Balance at December 31, 2024	105.2
New investments	1.4
(Decrease) increase in fair value of investments in equity securities	3.9
Foreign currency translation adjustments and other	1.0
Balance at September 30, 2025	$ 111.5

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