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Investments - Equity Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Equity securities $ 143.2 $ 200.5
Common stocks    
Debt Securities, Available-for-sale [Line Items]    
Equity securities 22.8 15.0
Perpetual preferred stocks    
Debt Securities, Available-for-sale [Line Items]    
Equity securities $ 120.4 $ 185.5