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Investments Net Investment Income (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Gain (Loss) on Investments [Line Items]    
Gross investment income $ 113.8 $ 107.5
Investment expenses [1] 1.7 1.7
Net investment income 112.1 105.8
Net realized gains (losses) 290.6 (107.7)
Realized from actual transactions 12.3 15.5
Unrealized from changes in fair value of equity securities 355.6 (152.0)
Realized Investment Gains Losses From Impairment 0.0 0.0
Total realized and unrealized investment gains (losses) 368.0 (136.4)
Current and deferred income taxes (credits)(b) [2] 77.4 (28.7)
Unrealized Gain (Loss) on Investments 138.3 (117.8)
Equity Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Equity securities, gross realized gains 41.1 14.9
Equity securities, gross realized losses (27.9) 0.0
Equity securities, net realized gains (losses) 13.2 14.9
Fixed Maturity Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Fixed maturity securities, gross realized gains 0.0 0.4
Fixed maturity securities, gross realized losses (0.9) (0.1)
Net realized gains (losses) (0.9) 0.2
Changes in unrealized investment gains (losses) on, fixed maturity securities 174.3 (148.7)
Less: Deferred income taxes (credits) 36.8 (31.3)
Net changes in unrealized investment gains (losses) 137.5 (117.4)
Equity securities & other long-term investments [Member]    
Gain (Loss) on Investments [Line Items]    
Changes in unrealized investment gains (losses) on, fixed maturity securities 0.9 (0.4)
Less: Deferred income taxes (credits) 0.1 0.0
Net changes in unrealized investment gains (losses) 0.7 (0.3)
Other Investments    
Gain (Loss) on Investments [Line Items]    
Other long-term investments, net 0.0 0.2
Fixed Maturity Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Gross investment income 74.6 74.2
Equity Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Gross investment income 35.0 30.4
Short-term Investments [Member]    
Gain (Loss) on Investments [Line Items]    
Gross investment income 2.4 1.9
Investments [Member]    
Gain (Loss) on Investments [Line Items]    
Gross investment income $ 1.6 $ 0.9
[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 and judgments about the recoverability of deferred tax assets.