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Investments - Variable Interest Entity (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Assets $ 5,543.3 $ 5,169.1
Liabilities 1,224.9 1,210.2
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Assets 10.4 10.6
Liabilities 2.5 $ 2.0
Maximum exposure to loss $ 10.4