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Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, net derivative assets (liabilities) $ (5.1) $ 13.0 $ 3.1
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) (6.9) 11.8 (0.8)
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 12.0 (3.4) 10.7
Transfers out of Level 3, net derivative assets (liabilities)   (26.5)  
Ending balance, net derivative assets (liabilities)   (5.1) 13.0
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) (0.6) 9.9 5.3
Gross purchases, sales, issuances and settlements      
Purchases, net derivative assets (liabilities)     1.9
Sales, net derivative assets (liabilities) 12.0 (3.4) 8.8
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 12.0 (3.4) 10.7
Investment and universal life contracts      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, liabilities (467.8) (214.2) (45.2)
Total realized/unrealized gains (losses) included in net income, liabilities 81.7 (254.9) (145.5)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities 0.2 (0.3) (0.2)
Net purchases, sales, issuances and settlements, liabilities 29.6 1.6 (23.3)
Ending balance, liabilities (356.3) (467.8) (214.2)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 80.3 (262.1) (146.0)
Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities 0.2 (0.3)  
Gross purchases, sales, issuances and settlements      
Issuances, liabilities (16.4) (23.0) (33.4)
Settlements, liabilities 46.0 24.6 10.1
Net purchases, sales, issuances and settlements, liabilities 29.6 1.6 (23.3)
Fixed maturities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 360.4 384.9 138.8
Total realized/unrealized gains (losses) included in net income, assets (24.9) (4.5) (6.4)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 22.2 (16.7) 7.6
Net purchases, sales, issuances and settlements, assets 826.4 263.0 237.5
Transfers into Level 3, assets 352.9 388.4 86.0
Transfers out of Level 3, assets (460.8) (654.7) (78.6)
Ending balance, assets 1,076.2 360.4 384.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (7.6) (3.4) (5.5)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 13.6 13.1  
Gross purchases, sales, issuances and settlements      
Purchases, assets 1,125.4 366.0 276.7
Sales, assets (84.3) (5.5) (1.4)
Settlements, assets (214.7) (97.5) (37.8)
Net purchases, sales, issuances and settlements, assets 826.4 263.0 237.5
Fixed maturities | Trading      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets   0.3  
Net purchases, sales, issuances and settlements, assets 4.9   0.3
Transfers out of Level 3, assets   (0.3)  
Ending balance, assets 4.9   0.3
Gross purchases, sales, issuances and settlements      
Purchases, assets 4.9   0.5
Settlements, assets     (0.2)
Net purchases, sales, issuances and settlements, assets 4.9   0.3
Non-U.S. governments | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets     4.6
Net purchases, sales, issuances and settlements, assets     (4.6)
Gross purchases, sales, issuances and settlements      
Settlements, assets     (4.6)
Net purchases, sales, issuances and settlements, assets     (4.6)
States and political subdivisions | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Total realized/unrealized gains (losses) included in other comprehensive income, assets 12.8    
Net purchases, sales, issuances and settlements, assets (0.4)    
Transfers into Level 3, assets 82.4    
Ending balance, assets 94.8    
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 12.8    
Gross purchases, sales, issuances and settlements      
Settlements, assets (0.4)    
Net purchases, sales, issuances and settlements, assets (0.4)    
Corporate debt securities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 290.8 81.7 57.9
Total realized/unrealized gains (losses) included in net income, assets (21.9) (0.9)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets 7.8 5.2 2.5
Net purchases, sales, issuances and settlements, assets 381.8 118.0 17.2
Transfers into Level 3, assets 175.8 342.0 4.1
Transfers out of Level 3, assets   (255.2)  
Ending balance, assets 834.3 290.8 81.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (4.6)    
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.7) 11.9  
Gross purchases, sales, issuances and settlements      
Purchases, assets 626.6 169.2 41.9
Sales, assets (84.3) (5.5) (1.4)
Settlements, assets (160.5) (45.7) (23.3)
Net purchases, sales, issuances and settlements, assets 381.8 118.0 17.2
Commercial mortgage-backed securities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 13.2 12.9 9.5
Total realized/unrealized gains (losses) included in net income, assets (1.0) (1.3) (3.8)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.4) 1.4 3.4
Net purchases, sales, issuances and settlements, assets 7.4 (0.1) 2.4
Transfers into Level 3, assets   0.3 3.7
Transfers out of Level 3, assets     (2.3)
Ending balance, assets 19.2 13.2 12.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.0) (1.2) (2.9)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.4) 1.5  
Gross purchases, sales, issuances and settlements      
Purchases, assets 7.7   2.4
Settlements, assets (0.3) (0.1)  
Net purchases, sales, issuances and settlements, assets 7.4 (0.1) 2.4
Collateralized debt obligations | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 27.2 199.0 8.3
Total realized/unrealized gains (losses) included in net income, assets (2.0) (2.3) (2.6)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 1.6 (21.9) 0.9
Net purchases, sales, issuances and settlements, assets 420.7 183.0 122.5
Transfers into Level 3, assets 74.1   69.9
Transfers out of Level 3, assets (435.8) (330.6)  
Ending balance, assets 85.8 27.2 199.0
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (2.0) (2.2) (2.6)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 1.9 (0.3)  
Gross purchases, sales, issuances and settlements      
Purchases, assets 446.0 182.5 124.7
Settlements, assets (25.3) 0.5 (2.2)
Net purchases, sales, issuances and settlements, assets 420.7 183.0 122.5
Other debt obligations | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 29.2 91.3 58.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.4 (1.4) 0.8
Net purchases, sales, issuances and settlements, assets 16.9 (37.9) 100.0
Transfers into Level 3, assets 20.6 46.1 8.3
Transfers out of Level 3, assets (25.0) (68.9) (76.3)
Ending balance, assets 42.1 29.2 91.3
Gross purchases, sales, issuances and settlements      
Purchases, assets 45.1 14.3 107.7
Settlements, assets (28.2) (52.2) (7.7)
Net purchases, sales, issuances and settlements, assets 16.9 (37.9) 100.0
Other investments      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 31.9 39.0 17.2
Total realized/unrealized gains (losses) included in net income, assets 12.5 6.3 6.0
Total realized/unrealized gains (losses) included in other comprehensive income, assets (1.3) (2.9)  
Net purchases, sales, issuances and settlements, assets (41.0) (10.5) 5.8
Transfers into Level 3, assets     10.0
Ending balance, assets 2.1 31.9 39.0
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 12.5 5.3 6.0
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (1.3) (2.9)  
Gross purchases, sales, issuances and settlements      
Purchases, assets   0.5 10.7
Sales, assets (41.0) (11.0) (4.9)
Net purchases, sales, issuances and settlements, assets (41.0) (10.5) 5.8
Separate account assets      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 8,893.2 8,968.0 8,615.5
Total realized/unrealized gains (losses) included in net income, assets 313.1 463.7 739.9
Net purchases, sales, issuances and settlements, assets (8,261.0) (538.5) (214.2)
Transfers out of Level 3, assets     (173.2)
Ending balance, assets 945.3 8,893.2 8,968.0
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 90.5 385.5 697.1
Gross purchases, sales, issuances and settlements      
Purchases, assets 38.5 309.2 279.1
Sales, assets (8,206.2) (658.2) (526.4)
Issuances, assets (191.5) (396.1) (280.4)
Settlements, assets 98.2 206.6 313.5
Net purchases, sales, issuances and settlements, assets $ (8,261.0) $ (538.5) $ (214.2)