Investments - Investments in Equity Securities (Details) $ in Millions	3 Months Ended
Mar. 31, 2023 USD ($)
Equity Securities
Beginning balance	$ 96.5
Decrease in fair value of investments in equity securities	(2.0)
Foreign currency translation adjustments and other	0.1
Ending balance	94.6
Investment in Equity Securities Level 1
Equity Securities
Beginning balance	17.2
Decrease in fair value of investments in equity securities	0.5
Foreign currency translation adjustments and other	0.2
Ending balance	17.9
Investment in Equity Securities, Level 2
Equity Securities
Beginning balance	7.8
Decrease in fair value of investments in equity securities	(2.5)
Foreign currency translation adjustments and other	0.0
Ending balance	5.3
Investments in Equity Securities, All Others
Equity Securities
Beginning balance	71.5
Decrease in fair value of investments in equity securities	0.0
Foreign currency translation adjustments and other	(0.1)
Ending balance	$ 71.4

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+ References

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=123583714&loc=SL75117360-209713

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 19
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3444-108585

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