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Investments - OTTI (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
securities
Mar. 31, 2019
USD ($)
securities
Available-for-sale Securities Including Securities Pledged [Line Items]    
Impairment $ 7.0 $ 18.0
No. of Securities | securities 10 15
Write-downs related to credit impairments $ 0.0 $ 18.0
Intent Impairments 7.0 0.0
U.S. corporate public securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Impairment $ 6.0 $ 0.0
No. of Securities | securities 2 0
Foreign corporate public securities and foreign governments    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Impairment $ 0.0 $ 0.0
No. of Securities | securities 0 0
Foreign corporate private securities    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Impairment $ 0.0 $ 18.0
No. of Securities | securities 0 3
Residential mortgage-backed    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Impairment $ 1.0 $ 0.0
No. of Securities | securities 7 10
Commercial mortgage-backed    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Impairment $ 0.0 $ 0.0
No. of Securities | securities 1 0
Limited Partnerships    
Available-for-sale Securities Including Securities Pledged [Line Items]    
Impairment $ 0.0 $ 0.0
No. of Securities | securities 0 2