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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, net derivative assets (liabilities) $ (0.7) $ (10.7) $ 0.0 $ (5.1)
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) (0.6) 1.2 (2.0) (4.4)
Total realized/unrealized gains (losses) included in other comprehensive income, net derivative assets (liabilities) (0.3)   (0.3)  
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 1.7 0.6 2.4 0.6
Transfers out of Level 3, net derivative assets (liabilities) (0.3)   (0.3)  
Ending balance, net derivative assets (liabilities) (0.2) (8.9) (0.2) (8.9)
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) 1.0 1.1 (0.2) (3.8)
Changes in unrealized gains (losses) included in OCI relating to positions still held, derivative assets (0.2)   (0.2)  
Gross purchases, sales, issuances and settlements        
Sales, net derivative assets (liabilities) 1.7 0.6 2.4 0.6
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 1.7 0.6 2.4 0.6
Investment and universal life contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (153.8) (177.1) (356.3) (467.8)
Total realized/unrealized gains (losses) included in net income, liabilities 73.9 (113.7) 268.2 169.7
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities     0.2 0.1
Net purchases, sales, issuances and settlements, liabilities 4.4 9.2 12.4 16.4
Ending balance, liabilities (75.5) (281.6) (75.5) (281.6)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 70.2 (113.9) 262.0 166.0
Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities 0.1   0.2 0.1
Gross purchases, sales, issuances and settlements        
Issuances, liabilities (1.6) (3.5) (7.1) (8.2)
Settlements, liabilities 6.0 12.7 19.5 24.6
Net purchases, sales, issuances and settlements, liabilities 4.4 9.2 12.4 16.4
Funds withheld payable embedded derivative        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities 0.0   0.0  
Total realized/unrealized gains (losses) included in net income, liabilities 3,067.3   3,067.3  
Ending balance, liabilities 3,067.3   3,067.3  
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 3,067.3   3,067.3  
Fixed maturities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1,331.6 714.6 1,076.2 360.4
Total realized/unrealized gains (losses) included in net income, assets (0.4) (6.6) (3.4) (7.9)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (41.5) 7.1 (47.9) (2.6)
Net purchases, sales, issuances and settlements, assets 124.0 211.3 317.6 445.9
Transfers into Level 3, assets 13.1 116.6 188.3 247.2
Transfers out of Level 3, assets (65.5) (225.4) (169.5) (225.4)
Ending balance, assets 1,361.3 817.6 1,361.3 817.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (6.4)   (7.7)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (41.8) 5.2 (47.6) (4.6)
Gross purchases, sales, issuances and settlements        
Purchases, assets 160.0 267.0 406.4 560.3
Sales, assets (9.1)   (29.5) (10.9)
Settlements, assets (26.9) (55.7) (59.3) (103.5)
Net purchases, sales, issuances and settlements, assets 124.0 211.3 317.6 445.9
Fixed maturities | Trading        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 62.4   4.9  
Total realized/unrealized gains (losses) included in net income, assets (0.5)   (0.5)  
Net purchases, sales, issuances and settlements, assets 23.8   52.3  
Transfers into Level 3, assets     29.0  
Ending balance, assets 85.7   85.7  
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.5)   (0.5)  
Gross purchases, sales, issuances and settlements        
Purchases, assets 24.0   52.5  
Settlements, assets (0.2)   (0.2)  
Net purchases, sales, issuances and settlements, assets 23.8   52.3  
States and political subdivisions | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 94.5   94.8  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (19.4)   (19.3)  
Net purchases, sales, issuances and settlements, assets (0.4)   (0.8)  
Transfers into Level 3, assets 12.0   12.0  
Ending balance, assets 86.7   86.7  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (19.5)   (19.4)  
Gross purchases, sales, issuances and settlements        
Settlements, assets (0.4)   (0.8)  
Net purchases, sales, issuances and settlements, assets (0.4)   (0.8)  
Corporate debt securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1,140.8 343.3 834.3 290.8
Total realized/unrealized gains (losses) included in net income, assets (0.4) (4.9) (3.4) (4.9)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (21.9) 5.4 (26.6) (4.7)
Net purchases, sales, issuances and settlements, assets 129.1 124.9 268.1 125.3
Transfers into Level 3, assets 1.1 80.3 176.3 142.5
Ending balance, assets 1,248.7 549.0 1,248.7 549.0
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (4.7)   (4.7)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (21.9) 3.0 (27.4) (6.2)
Gross purchases, sales, issuances and settlements        
Purchases, assets 160.0 156.0 350.9 200.8
Sales, assets (4.9)   (25.3) (10.9)
Settlements, assets (26.0) (31.1) (57.5) (64.6)
Net purchases, sales, issuances and settlements, assets 129.1 124.9 268.1 125.3
Commercial mortgage-backed securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 18.1 11.5 19.2 13.2
Total realized/unrealized gains (losses) included in net income, assets   (0.2)   (1.0)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.2 0.2 (0.7) (0.5)
Net purchases, sales, issuances and settlements, assets (4.3) 0.1 (4.5) (0.1)
Transfers out of Level 3, assets (10.2)   (10.2)  
Ending balance, assets 3.8 11.6 3.8 11.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.2)   (1.0)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.1) 0.2 (0.3) (0.5)
Gross purchases, sales, issuances and settlements        
Sales, assets (4.2)   (4.2)  
Settlements, assets (0.1) 0.1 (0.3) (0.1)
Net purchases, sales, issuances and settlements, assets (4.3) 0.1 (4.5) (0.1)
Collateralized debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 57.0 323.3 85.8 27.2
Total realized/unrealized gains (losses) included in net income, assets   (1.5)   (2.0)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.4) 1.7 (0.7) 1.8
Net purchases, sales, issuances and settlements, assets   61.2 55.5 309.9
Transfers into Level 3, assets   36.3   84.1
Transfers out of Level 3, assets (55.3) (225.4) (139.3) (225.4)
Ending balance, assets 1.3 195.6 1.3 195.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (1.5)   (2.0)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.3) 2.0 (0.5) 2.1
Gross purchases, sales, issuances and settlements        
Purchases, assets   85.9 55.5 334.4
Settlements, assets   (24.7)   (24.5)
Net purchases, sales, issuances and settlements, assets   61.2 55.5 309.9
Other debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 21.2 36.5 42.1 29.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (0.2) (0.6) 0.8
Net purchases, sales, issuances and settlements, assets (0.4) 25.1 (0.7) 10.8
Transfers into Level 3, assets       20.6
Transfers out of Level 3, assets     (20.0)  
Ending balance, assets 20.8 61.4 20.8 61.4
Gross purchases, sales, issuances and settlements        
Purchases, assets   25.1   25.1
Settlements, assets (0.4)   (0.7) (14.3)
Net purchases, sales, issuances and settlements, assets (0.4) 25.1 (0.7) 10.8
Other investments.        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1.4 41.1 2.1 31.9
Total realized/unrealized gains (losses) included in net income, assets   3.4   12.6
Total realized/unrealized gains (losses) included in other comprehensive income, assets     (0.7)  
Ending balance, assets 1.4 44.5 1.4 44.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   3.4   12.7
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 1,015.4 1,196.2 945.3 8,893.2
Total realized/unrealized gains (losses) included in net income, assets 44.3 49.1 115.7 144.6
Net purchases, sales, issuances and settlements, assets (1.1) (27.9) (2.4) (7,820.4)
Ending balance, assets 1,058.6 1,217.4 1,058.6 1,217.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 44.5 47.6 112.8 144.1
Gross purchases, sales, issuances and settlements        
Purchases, assets       36.7
Sales, assets   (0.7)   (7,793.2)
Issuances, assets (0.8) (27.0) (1.9) (141.0)
Settlements, assets (0.3) (0.2) (0.5) 77.1
Net purchases, sales, issuances and settlements, assets $ (1.1) $ (27.9) $ (2.4) $ (7,820.4)