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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Schedule of Equity Method Investments
Limited partnership interests	$ 828.4	$ 712.8
Commercial mortgage loan funds
Schedule of Equity Method Investments
Limited partnership interests	446.4	346.8
Private equity funds
Schedule of Equity Method Investments
Limited partnership interests	68.2	74.0
Infrastructure debt funds
Schedule of Equity Method Investments
Limited partnership interests	68.3	62.4
Infrastructure equity funds
Schedule of Equity Method Investments
Limited partnership interests	67.3	58.3
Other funds
Schedule of Equity Method Investments
Limited partnership interests	$ 178.2	$ 171.3

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Amount of investment in equity method investee and investment in and advance to affiliate.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(18))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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