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Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues:                        
Earned Premiums $ 1,214.0 $ 1,206.5 $ 1,085.3 $ 1,166.4 $ 1,145.8 $ 1,135.2 $ 1,116.6 $ 1,074.8   $ 4,672.2 $ 4,472.4 $ 3,384.4
Net Investment Income 102.7 92.1 67.8 85.6 93.9 91.7 96.0 82.7   348.2 364.3 340.9
Other Income 1.9 0.9 1.5 90.3 3.7 7.2 22.7 1.9   94.6 35.5 42.2
Income (Loss) from Change in Fair Value of Equity and Convertible Securities 73.1 45.2 71.6 (117.8) 39.2 9.8 25.5 64.4   72.1 138.9 (64.3)
Net Realized Gains on Sales of Investments (0.1) 10.0 11.7 16.5 2.8 1.7 21.3 16.1   38.1 41.9 26.4
Other-than-temporary Impairment Losses:                        
Other than Temporary Impairment Losses, Investments                 $ (4.5) (19.5) (13.7)  
Impairment Losses 0.5 (1.0) (7.0) (12.0) (1.7) (1.8) (6.7) (3.6)   (19.5) (13.8) (4.5)
Total Revenues 1,392.1 1,353.7 1,230.9 1,229.0 1,283.7 1,243.8 1,275.4 1,236.3   5,205.7 5,039.2 3,725.1
Expenses:                        
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses 863.4 877.5 747.5 835.2 814.9 782.6 825.4 765.4   3,323.6 3,188.3 2,466.5
Insurance Expenses 279.3 276.9 272.7 271.6 265.4 256.0 263.5 234.8   1,100.5 1,019.7 900.5
Loss from Early Extinguishment of Debt           5.8       0.0 5.8 0.0
Interest and Other Expenses 128.8 47.2 51.0 44.5 46.5 37.9 38.0 41.4   271.5 163.8 159.0
Total Expenses 1,271.5 1,201.6 1,071.2 1,151.3 1,126.8 1,082.3 1,126.9 1,041.6   4,695.6 4,377.6 3,526.0
Income from Continuing Operations before Income Taxes 120.6 152.1 159.7 77.7 156.9 161.5 148.5 194.7   510.1 661.6 199.1
Income Tax Expense (23.1) (29.8) (33.6) (13.7) (32.2) (32.5) (26.4) (39.4)   (100.2) (130.5) (10.7)
Income from Continuing Operations 97.5 122.3 126.1 64.0         $ 188.4 409.9 531.1 188.4
Income from Discontinued Operations                   0.0 0.0 1.7
Net Income $ 97.5 $ 122.3 $ 126.1 $ 64.0 $ 124.7 $ 129.0 $ 122.1 $ 155.3   $ 409.9 $ 531.1 $ 190.1
Income from Continuing Operations Per Unrestricted Share:                        
Basic (in dollars per share)         $ 1.87 $ 1.93 $ 1.87 $ 2.38 $ 3.22 $ 6.24 $ 8.04 $ 3.22
Diluted (in dollars per share)         1.85 1.91 1.84 2.35 $ 3.19 6.14 7.96 3.19
Net Income Per Unrestricted Share:                        
Basic (in dollars per share) $ 1.49 $ 1.87 $ 1.93 $ 0.96 1.87 1.93 1.87 2.38   6.24 8.04 3.25
Diluted (in dollars per share) 1.46 1.83 1.91 0.95 1.85 1.91 1.84 2.35   6.14 7.96 3.22
Dividends paid to shareholders per share (in dollars per share) $ 0.30 $ 0.30 $ 0.30 $ 0.30 $ 0.28 $ 0.25 $ 0.25 $ 0.25   $ 1.20 $ 1.03 $ 0.96