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Fair Value of Financial Instruments - Schedule of Changes in Level 3 Financial Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Changes in balances of Level 3 financial assets          
Balance at beginning of period $ 806.7 $ 231.7 $ 701.6 $ 199.7 $ 199.7
Total realized/unrealized net earnings (loss) (5.1) 0.8 (5.2) 1.6  
Total realized/unrealized other comp. income (loss) (0.5) (2.5) 22.7 (3.9)  
Purchases and issuances 63.3 46.9 118.9 122.3  
Sales and settlements (117.5) (22.8) (196.4) (72.1)  
Transfer into Level 3 7.2 14.7 117.8 24.6  
Transfer out of Level 3 (38.8) (8.9) (44.1) (12.3)  
Balance at end of period 715.3 259.9 715.3 259.9 701.6
Changes in balances of Level 3 financial liabilities          
Balance at beginning of period 8.8 4.1 11.9 4.8 4.8
Total realized/unrealized net earnings (loss) (3.5) 0.1 (6.6) (0.6)  
Total realized/unrealized other comp. income (loss) 0.0 0.0 0.0 0.0  
Purchases and issuances 3.0 0.0 3.0 0.0  
Sales and settlements 0.0 0.0 0.0 0.0  
Transfer into Level 3 0.0 0.0 0.0 0.0  
Transfer out of Level 3 0.0 0.0 0.0 0.0  
Balance at end of period 8.3 4.2 $ 8.3 4.2 11.9
Assets, Total | Level 3          
Changes in balances of Level 3 financial liabilities          
Percent of total assets (less than)     1.00%    
Fixed maturity securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 745.5 206.9 $ 640.4 192.8 192.8
Total realized/unrealized net earnings (loss) (1.7) 0.5 (1.7) 1.3  
Total realized/unrealized other comp. income (loss) (0.5) (2.5) 22.7 (3.9)  
Purchases and issuances 60.8 46.9 116.4 107.4  
Sales and settlements (116.5) (22.8) (195.4) (72.1)  
Transfer into Level 3 4.2 14.7 114.8 21.6  
Transfer out of Level 3 (38.5) (8.9) (43.9) (12.3)  
Balance at end of period 653.3 234.8 653.3 234.8 640.4
States, municipalities and political subdivisions          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 0.0 6.4 0.0 6.0 6.0
Total realized/unrealized net earnings (loss) 0.0 0.0 0.0 0.0  
Total realized/unrealized other comp. income (loss) 0.0 0.0 0.0 (0.1)  
Purchases and issuances 0.0 0.0 0.0 0.1  
Sales and settlements (0.5) 0.0 (0.5) 0.0  
Transfer into Level 3 4.2 0.0 4.2 0.4  
Transfer out of Level 3 0.0 (6.0) 0.0 (6.0)  
Balance at end of period 3.7 0.4 3.7 0.4 0.0
Residential mortgage-backed securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 13.1 7.2 19.0 14.6 14.6
Total realized/unrealized net earnings (loss) 0.0 0.0 0.0 0.1  
Total realized/unrealized other comp. income (loss) 0.2 0.3 0.3 0.6  
Purchases and issuances 0.0 0.0 0.0 0.0  
Sales and settlements (0.5) (0.8) (0.8) (5.1)  
Transfer into Level 3 0.0 5.6 0.0 5.5  
Transfer out of Level 3 (0.3) 0.0 (6.0) (3.4)  
Balance at end of period 12.5 12.3 12.5 12.3 19.0
Commercial mortgage-backed securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 61.8 17.8 58.2 12.2 12.2
Total realized/unrealized net earnings (loss) 0.0 0.0 0.0 (0.1)  
Total realized/unrealized other comp. income (loss) 0.6 (0.2) 2.1 (0.3)  
Purchases and issuances 5.1 4.5 7.5 10.3  
Sales and settlements (0.1) 0.0 (0.5) 0.0  
Transfer into Level 3 0.0 0.0 0.0 0.0  
Transfer out of Level 3 (1.0) 0.0 (0.9) 0.0  
Balance at end of period 66.4 22.1 66.4 22.1 58.2
Asset-backed securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 472.1 137.9 478.2 133.7 133.7
Total realized/unrealized net earnings (loss) (1.6) 0.5 (1.6) 1.2  
Total realized/unrealized other comp. income (loss) 4.7 (1.8) 18.0 (3.2)  
Purchases and issuances 39.9 18.5 88.5 68.0  
Sales and settlements (102.5) (19.4) (176.1) (64.0)  
Transfer into Level 3 0.0 0.0 5.6 0.0  
Transfer out of Level 3 0.0 (2.9) 0.0 (2.9)  
Balance at end of period 412.6 132.8 412.6 132.8 478.2
Corporate and other          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 198.5 37.6 85.0 26.3 26.3
Total realized/unrealized net earnings (loss) (0.1) 0.0 (0.1) 0.1  
Total realized/unrealized other comp. income (loss) (6.0) (0.8) 2.3 (0.9)  
Purchases and issuances 15.8 23.9 20.4 29.0  
Sales and settlements (12.9) (2.6) (17.5) (3.0)  
Transfer into Level 3 0.0 9.1 105.0 15.7  
Transfer out of Level 3 (37.2) 0.0 (37.0) 0.0  
Balance at end of period 158.1 67.2 158.1 67.2 85.0
Total equity securities          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 61.2 24.5 61.2 6.6 6.6
Total realized/unrealized net earnings (loss) (3.4) 0.3 (3.5) 0.3  
Total realized/unrealized other comp. income (loss) 0.0 0.0 0.0 0.0  
Purchases and issuances 2.5 0.0 2.5 14.9  
Sales and settlements (1.0) 0.0 (1.0) 0.0  
Transfer into Level 3 3.0 0.0 3.0 3.0  
Transfer out of Level 3 (0.3) 0.0 (0.2) 0.0  
Balance at end of period 62.0 24.8 62.0 24.8 61.2
Common Stock          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 6.1 0.6 5.9 0.2 0.2
Total realized/unrealized net earnings (loss) 0.0 (0.1) 0.2 (0.1)  
Total realized/unrealized other comp. income (loss) 0.0 0.0 0.0 0.0  
Purchases and issuances 0.0 0.0 0.0 0.0  
Sales and settlements (1.0) 0.0 (1.0) 0.0  
Transfer into Level 3 0.0 0.0 0.0 0.4  
Transfer out of Level 3 (0.2) 0.0 (0.2) 0.0  
Balance at end of period 4.9 0.5 4.9 0.5 5.9
Perpetual preferred stocks          
Changes in balances of Level 3 financial assets          
Balance at beginning of period 55.1 23.9 55.3 6.4 6.4
Total realized/unrealized net earnings (loss) (3.4) 0.4 (3.7) 0.4  
Total realized/unrealized other comp. income (loss) 0.0 0.0 0.0 0.0  
Purchases and issuances 2.5 0.0 2.5 14.9  
Sales and settlements 0.0 0.0 0.0 0.0  
Transfer into Level 3 3.0 0.0 3.0 2.6  
Transfer out of Level 3 (0.1) 0.0 0.0 0.0  
Balance at end of period 57.1 24.3 57.1 24.3 55.3
Derivatives          
Changes in balances of Level 3 financial assets          
Balance at beginning of period   0.3   0.3 0.3
Total realized/unrealized net earnings (loss)   0.0   0.0  
Total realized/unrealized other comp. income (loss)   0.0   0.0  
Purchases and issuances   0.0   0.0  
Sales and settlements   0.0   0.0  
Transfer into Level 3   0.0   0.0  
Transfer out of Level 3   0.0   0.0  
Balance at end of period   0.3   0.3  
Embedded derivative          
Changes in balances of Level 3 financial liabilities          
Balance at beginning of period 6.1   8.4    
Total realized/unrealized net earnings (loss) (3.2)   (5.5)    
Total realized/unrealized other comp. income (loss) 0.0   0.0    
Purchases and issuances 0.0   0.0    
Sales and settlements 0.0   0.0    
Transfer into Level 3 0.0   0.0    
Transfer out of Level 3 0.0   0.0    
Balance at end of period 2.9   2.9   8.4
Other          
Changes in balances of Level 3 financial liabilities          
Balance at beginning of period 2.7 4.1 3.5 4.8 4.8
Total realized/unrealized net earnings (loss) (0.3) 0.1 (1.1) (0.6)  
Total realized/unrealized other comp. income (loss) 0.0 0.0 0.0 0.0  
Purchases and issuances 3.0 0.0 3.0 0.0  
Sales and settlements 0.0 0.0 0.0 0.0  
Transfer into Level 3 0.0 0.0 0.0 0.0  
Transfer out of Level 3 0.0 0.0 0.0 0.0  
Balance at end of period $ 5.4 $ 4.2 $ 5.4 $ 4.2 $ 3.5