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Investments Other Invested Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other Invested Assets [Abstract]    
Alternative Investment $ 16.2 $ 9.1
Other Investments, at Cost 36.8 28.4
Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures 20.0 20.0
Other Investments 36.2 29.1
Unfunded commitment, private investment fund 63.8 41.6
Investment Owned, at Cost $ 16.8 $ 8.4