Investments - Investments in Equity Securities (Details) $ in Millions	9 Months Ended
Sep. 30, 2023 USD ($)
Equity Securities
Beginning balance	$ 96.5
New investments	6.0
Decrease in fair value of investments in equity securities	(11.8)
Foreign currency translation adjustments and other	(0.1)
Ending balance	90.6
Investment in Equity Securities Level 1
Equity Securities
Beginning balance	17.2
New investments	0.0
Decrease in fair value of investments in equity securities	(10.2)
Foreign currency translation adjustments and other	0.0
Ending balance	7.0
Investment in Equity Securities, Level 2
Equity Securities
Beginning balance	7.8
New investments	0.0
Decrease in fair value of investments in equity securities	(1.6)
Foreign currency translation adjustments and other	0.0
Ending balance	6.2
Investments in Equity Securities, All Others
Equity Securities
Beginning balance	71.5
New investments	6.0
Decrease in fair value of investments in equity securities	0.0
Foreign currency translation adjustments and other	(0.1)
Ending balance	$ 77.4

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482736/825-10-45-1A

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Amount of increase (decrease) of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 19
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-19

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Topic 321
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479567/321-10-45-1

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