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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, net derivative assets $ (15.6) $ 3.4 $ 13.0 $ 3.1
Total realized/unrealized gains (losses) included in net income, net derivative assets 2.5 6.6 1.8 5.0
Net purchases, sales, issuances and settlements, net derivative assets (1.1) 5.8 (2.5) 7.7
Transfers out of Level 3, net derivative assets     (26.5)  
Ending balance, net derivative assets (14.2) 15.8 (14.2) 15.8
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets 2.6 11.2 0.5 8.9
Gross purchases, sales, issuances and settlements        
Sales, net derivative assets (liabilities) (1.1) 5.8 (2.5) 7.7
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) (1.1) 5.8 (2.5) 7.7
Investment and universal life contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (555.4) (40.5) (214.2) (45.2)
Total realized/unrealized gains (losses) included in net income, liabilities (18.3) (76.2) (358.7) (71.9)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities   (0.2) (0.3) (0.1)
Net purchases, sales, issuances and settlements, liabilities (2.3) (1.8) (2.8) (1.5)
Ending balance, liabilities (576.0) (118.7) (576.0) (118.7)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (1.4) (75.5) (368.3) (70.3)
Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities     (0.3)  
Gross purchases, sales, issuances and settlements        
Issuances, liabilities (5.5) (3.5) (12.2) (4.8)
Settlements, liabilities 3.2 1.7 9.4 3.3
Net purchases, sales, issuances and settlements, liabilities (2.3) (1.8) (2.8) (1.5)
Fixed maturities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 460.9 124.0 384.9 138.8
Total realized/unrealized gains (losses) included in net income, assets (1.8) (3.2) (1.9) (5.7)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 6.5 3.9 (33.5) 5.5
Net purchases, sales, issuances and settlements, assets (31.3) 0.3 150.1 12.4
Transfers into Level 3, assets 217.3 33.7 388.1 33.7
Transfers out of Level 3, assets (289.5) (2.3) (525.6) (28.3)
Ending balance, assets 362.1 156.4 362.1 156.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.8) (2.1) (1.9) (4.6)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 4.8   (0.1)  
Gross purchases, sales, issuances and settlements        
Purchases, assets 7.4 22.0 191.0 34.9
Sales, assets (0.5) (0.2) (1.0) (0.4)
Settlements, assets (38.2) (21.5) (39.9) (22.1)
Net purchases, sales, issuances and settlements, assets (31.3) 0.3 150.1 12.4
Fixed maturities | Trading        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 0.3   0.3  
Net purchases, sales, issuances and settlements, assets   0.5   0.5
Transfers out of Level 3, assets (0.3)   (0.3)  
Ending balance, assets   0.5   0.5
Gross purchases, sales, issuances and settlements        
Purchases, assets   0.5   0.5
Net purchases, sales, issuances and settlements, assets   0.5   0.5
Non-U.S. governments | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets   4.2   4.6
Net purchases, sales, issuances and settlements, assets   (0.3)   (0.7)
Ending balance, assets   3.9   3.9
Gross purchases, sales, issuances and settlements        
Settlements, assets   (0.3)   (0.7)
Net purchases, sales, issuances and settlements, assets   (0.3)   (0.7)
Corporate debt securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 170.3 58.5 81.7 57.9
Total realized/unrealized gains (losses) included in other comprehensive income, assets 5.7   (10.6) 0.4
Net purchases, sales, issuances and settlements, assets (15.7) (13.8) 10.8 (13.6)
Transfers into Level 3, assets 217.3   342.0  
Transfers out of Level 3, assets (102.6)   (148.9)  
Ending balance, assets 275.0 44.7 275.0 44.7
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 5.7   (0.3)  
Gross purchases, sales, issuances and settlements        
Purchases, assets 7.4 5.2 34.9 5.7
Sales, assets (0.5) (0.2) (1.0) (0.4)
Settlements, assets (22.6) (18.8) (23.1) (18.9)
Net purchases, sales, issuances and settlements, assets (15.7) (13.8) 10.8 (13.6)
Commercial mortgage-backed securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 14.4 12.0 12.9 9.5
Total realized/unrealized gains (losses) included in net income, assets (0.9) (3.2) (0.9) (3.2)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.4) 2.9 1.1 3.2
Net purchases, sales, issuances and settlements, assets       2.2
Transfers into Level 3, assets   3.7   3.7
Transfers out of Level 3, assets   (2.3)   (2.3)
Ending balance, assets 13.1 13.1 13.1 13.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.9) (2.1) (0.9) (2.1)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.4)   1.1  
Gross purchases, sales, issuances and settlements        
Purchases, assets       2.4
Settlements, assets       (0.2)
Net purchases, sales, issuances and settlements, assets       2.2
Collateralized debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 171.3 5.9 199.0 8.3
Total realized/unrealized gains (losses) included in net income, assets (0.9)   (1.0) (2.5)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.5) 0.5 (22.6) 0.3
Net purchases, sales, issuances and settlements, assets 0.2 (1.6) 142.0 (1.3)
Transfers into Level 3, assets   30.0   30.0
Transfers out of Level 3, assets (167.3)   (314.6)  
Ending balance, assets 2.8 34.8 2.8 34.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.9)   (1.0) (2.5)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.5)   (0.9)  
Gross purchases, sales, issuances and settlements        
Purchases, assets     141.8  
Settlements, assets 0.2 (1.6) 0.2 (1.3)
Net purchases, sales, issuances and settlements, assets 0.2 (1.6) 142.0 (1.3)
Other debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 104.9 43.4 91.3 58.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets 1.7 0.5 (1.4) 1.6
Net purchases, sales, issuances and settlements, assets (15.8) 16.0 (2.7) 25.8
Transfers into Level 3, assets     46.1  
Transfers out of Level 3, assets (19.6)   (62.1) (26.0)
Ending balance, assets 71.2 59.9 71.2 59.9
Gross purchases, sales, issuances and settlements        
Purchases, assets   16.8 14.3 26.8
Settlements, assets (15.8) (0.8) (17.0) (1.0)
Net purchases, sales, issuances and settlements, assets (15.8) 16.0 (2.7) 25.8
Equity securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets   0.4    
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (0.4)    
Other investments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 36.0 29.4 39.0 17.2
Total realized/unrealized gains (losses) included in net income, assets 2.4 0.1 2.3 2.3
Total realized/unrealized gains (losses) included in other comprehensive income, assets     (2.9)  
Net purchases, sales, issuances and settlements, assets 0.3 (0.4) 0.3 (0.4)
Transfers into Level 3, assets       10.0
Ending balance, assets 38.7 29.1 38.7 29.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 2.4 0.1 2.3 2.3
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets     (2.9)  
Gross purchases, sales, issuances and settlements        
Purchases, assets 0.3 4.5 0.3 4.5
Sales, assets   (4.9)   (4.9)
Net purchases, sales, issuances and settlements, assets 0.3 (0.4) 0.3 (0.4)
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 8,866.7 8,718.7 8,968.0 8,615.5
Total realized/unrealized gains (losses) included in net income, assets 8.5 138.9 153.1 313.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets   0.5   0.1
Net purchases, sales, issuances and settlements, assets (53.9) 4.2 (299.8) (66.1)
Transfers out of Level 3, assets   (172.5)   (173.2)
Ending balance, assets 8,821.3 8,689.8 8,821.3 8,689.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 12.5 126.4 138.9 327.2
Gross purchases, sales, issuances and settlements        
Purchases, assets 0.4 41.0 68.0 120.0
Sales, assets (1.5) (112.8) (185.6) (214.5)
Issuances, assets (52.6) (156.5) (226.8) (203.8)
Settlements, assets (0.2) 232.5 44.6 232.2
Net purchases, sales, issuances and settlements, assets $ (53.9) $ 4.2 $ (299.8) $ (66.1)