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Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, net derivative assets (liabilities) $ (8.9) $ (14.2) $ (5.1) $ 13.0
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) (1.8) 4.7 (6.2) 6.5
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 10.7 (0.9) 11.3 (3.4)
Transfers out of Level 3, net derivative assets (liabilities)       (26.5)
Ending balance, net derivative assets (liabilities)   (10.4)   (10.4)
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) (0.7) 4.6 (0.6) 5.2
Gross purchases, sales, issuances and settlements        
Sales, net derivative assets (liabilities) 10.7 (0.9) 11.3 (3.4)
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 10.7 (0.9) 11.3 (3.4)
Investment and universal life contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (281.6) (576.0) (467.8) (214.2)
Total realized/unrealized gains (losses) included in net income, liabilities (80.4) 23.2 89.3 (335.5)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities 0.1   0.2 (0.3)
Net purchases, sales, issuances and settlements, liabilities 6.6 0.4 23.0 (2.4)
Ending balance, liabilities (355.3) (552.4) (355.3) (552.4)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (76.4) 29.4 86.1 (344.8)
Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities 0.1   0.2 (0.3)
Gross purchases, sales, issuances and settlements        
Issuances, liabilities (3.5) (6.3) (11.7) (18.5)
Settlements, liabilities 10.1 6.7 34.7 16.1
Net purchases, sales, issuances and settlements, liabilities 6.6 0.4 23.0 (2.4)
Fixed maturities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 817.6 362.1 360.4 384.9
Total realized/unrealized gains (losses) included in net income, assets (7.8) (2.3) (15.7) (4.2)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 10.2 4.5 7.6 (29.0)
Net purchases, sales, issuances and settlements, assets 245.3 8.5 691.2 158.6
Transfers into Level 3, assets 25.1 0.3 272.3 388.4
Transfers out of Level 3, assets (197.8) (31.3) (423.2) (556.9)
Ending balance, assets 892.6 341.8 892.6 341.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (7.8) (1.3) (14.6) (3.2)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 10.4 3.9 5.9 (1.6)
Gross purchases, sales, issuances and settlements        
Purchases, assets 298.8 58.6 859.1 249.6
Sales, assets (3.4) (4.4) (14.3) (5.4)
Settlements, assets (50.1) (45.7) (153.6) (85.6)
Net purchases, sales, issuances and settlements, assets 245.3 8.5 691.2 158.6
Fixed maturities | Trading        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets       0.3
Transfers out of Level 3, assets       (0.3)
Corporate debt securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 549.0 275.0 290.8 81.7
Total realized/unrealized gains (losses) included in net income, assets (7.8) (1.0) (12.7) (1.0)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 10.5 4.3 5.8 (6.3)
Net purchases, sales, issuances and settlements, assets 229.0 27.5 354.3 38.3
Transfers into Level 3, assets 25.1   167.6 342.0
Transfers out of Level 3, assets   (24.5)   (173.4)
Ending balance, assets 805.8 281.3 805.8 281.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (7.8)   (12.6)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 10.6 3.6 4.4 (2.1)
Gross purchases, sales, issuances and settlements        
Purchases, assets 268.5 42.6 469.3 77.5
Sales, assets (3.4) (4.4) (14.3) (5.4)
Settlements, assets (36.1) (10.7) (100.7) (33.8)
Net purchases, sales, issuances and settlements, assets 229.0 27.5 354.3 38.3
Commercial mortgage-backed securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 11.6 13.1 13.2 12.9
Total realized/unrealized gains (losses) included in net income, assets   (0.4) (1.0) (1.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.1)   (0.6) 1.1
Net purchases, sales, issuances and settlements, assets 2.7   2.6  
Transfers into Level 3, assets   0.3   0.3
Ending balance, assets 14.2 13.0 14.2 13.0
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.4)   (1.3)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.2)   (0.6) 1.1
Gross purchases, sales, issuances and settlements        
Purchases, assets 2.7   2.7  
Settlements, assets     (0.1)  
Net purchases, sales, issuances and settlements, assets 2.7   2.6  
Collateralized debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 195.6 2.8 27.2 199.0
Total realized/unrealized gains (losses) included in net income, assets   (0.9) (2.0) (1.9)
Total realized/unrealized gains (losses) included in other comprehensive income, assets   0.4 1.8 (22.2)
Net purchases, sales, issuances and settlements, assets 27.6 16.1 337.5 158.1
Transfers into Level 3, assets     84.1  
Transfers out of Level 3, assets (172.8)   (398.2) (314.6)
Ending balance, assets 50.4 18.4 50.4 18.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.9) (2.0) (1.9)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets   0.3 2.1 (0.6)
Gross purchases, sales, issuances and settlements        
Purchases, assets 27.6 16.0 362.0 157.8
Settlements, assets   0.1 (24.5) 0.3
Net purchases, sales, issuances and settlements, assets 27.6 16.1 337.5 158.1
Other debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 61.4 71.2 29.2 91.3
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.2) (0.2) 0.6 (1.6)
Net purchases, sales, issuances and settlements, assets (14.0) (35.1) (3.2) (37.8)
Transfers into Level 3, assets     20.6 46.1
Transfers out of Level 3, assets (25.0) (6.8) (25.0) (68.9)
Ending balance, assets 22.2 29.1 22.2 29.1
Gross purchases, sales, issuances and settlements        
Purchases, assets     25.1 14.3
Settlements, assets (14.0) (35.1) (28.3) (52.1)
Net purchases, sales, issuances and settlements, assets (14.0) (35.1) (3.2) (37.8)
Other investments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 44.5 38.7 31.9 39.0
Total realized/unrealized gains (losses) included in net income, assets (0.1) 2.7 12.5 5.0
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.6)   (0.6) (2.9)
Net purchases, sales, issuances and settlements, assets (41.1) (11.0) (41.1) (10.7)
Ending balance, assets 2.7 30.4 2.7 30.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.1) 1.7 12.6 4.0
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.6)   (0.6) (2.9)
Gross purchases, sales, issuances and settlements        
Purchases, assets       0.3
Sales, assets (41.1) (11.0) (41.1) (11.0)
Net purchases, sales, issuances and settlements, assets (41.1) (11.0) (41.1) (10.7)
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1,217.4 8,821.3 8,893.2 8,968.0
Total realized/unrealized gains (losses) included in net income, assets 71.0 72.3 215.6 225.4
Net purchases, sales, issuances and settlements, assets (21.1) (38.4) (7,841.5) (338.2)
Ending balance, assets 1,267.3 8,855.2 1,267.3 8,855.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 71.5 72.3 215.6 211.2
Gross purchases, sales, issuances and settlements        
Purchases, assets   4.2 36.7 72.2
Sales, assets (2.0) (0.2) (7,795.2) (185.8)
Issuances, assets (34.4) (42.2) (175.4) (269.0)
Settlements, assets 15.3 (0.2) 92.4 44.4
Net purchases, sales, issuances and settlements, assets $ (21.1) $ (38.4) $ (7,841.5) $ (338.2)