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Investments Net Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Gain (Loss) on Securities [Line Items]    
Gross investment income $ 115.8 $ 113.8
Investment expenses [1] 1.6 1.7
Net investment income 114.1 112.1
Net realized gains (losses) (745.6) 290.6
Realized from actual transactions 18.5 12.3
Realized Investment Gains Losses From Impairment 0.0 0.0
Equity Securities, FV-NI, Unrealized Gain (Loss) (962.7) 355.6
Total realized and unrealized investment gains (losses) (944.1) 368.0
Current and deferred income taxes (credits)(b) [2] (198.5) 77.4
Changes in unrealized investment gains (losses) on, fixed maturity securities (173.5) 175.3
Less: Deferred income taxes (credits) (36.3) 36.9
Unrealized Gain (Loss) on Investments (137.1) 138.3
Equity Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Equity securities, gross realized gains 19.4 41.1
Equity securities, gross realized losses (1.2) (27.9)
Equity securities, net realized gains (losses) 18.2 13.2
Fixed Maturity Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Fixed maturity securities, gross realized gains 0.9 0.0
Fixed maturity securities, gross realized losses (0.5) (0.9)
Net realized gains (losses) 0.3 (0.9)
Changes in unrealized investment gains (losses) on, fixed maturity securities (172.8) 174.3
Less: Deferred income taxes (credits) (36.2) 36.8
Net changes in unrealized investment gains (losses) (136.6) 137.5
Equity securities & other long-term investments [Member]    
Gain (Loss) on Securities [Line Items]    
Changes in unrealized investment gains (losses) on, fixed maturity securities (0.7) 0.9
Less: Deferred income taxes (credits) (0.1) 0.1
Net changes in unrealized investment gains (losses) (0.5) 0.7
Other Investments    
Gain (Loss) on Securities [Line Items]    
Investment gains (losses) - other investments 0.0 0.0
Fixed Maturity Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Gross investment income 74.5 74.6
Equity Securities [Member]    
Gain (Loss) on Securities [Line Items]    
Gross investment income 38.1 35.0
Short-term Investments [Member]    
Gain (Loss) on Securities [Line Items]    
Gross investment income 1.9 2.4
Investments [Member]    
Gain (Loss) on Securities [Line Items]    
Gross investment income $ 1.1 $ 1.6
[1]
Investment expenses largely consist of personnel costs and investment management and custody service fees.
[2]
Reflects primarily the combination of fully taxable investment gains or losses.