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Investments - Carrying Amount of Equity Method Limited Partnership Interests (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments
Limited partnership interests	$ 615.4	$ 449.0
Senior commercial mortgage loan funds
Schedule of Equity Method Investments
Limited partnership interests	265.8	149.6
Infrastructure debt funds
Schedule of Equity Method Investments
Limited partnership interests	62.7	58.3
Infrastructure equity funds
Schedule of Equity Method Investments
Limited partnership interests	59.1	52.1
Hedge funds
Schedule of Equity Method Investments
Limited partnership interests	51.1	63.2
Other funds
Schedule of Equity Method Investments
Limited partnership interests	$ 176.7	$ 125.8

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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