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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

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