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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, net derivative assets $ 13.0 $ 3.1 $ 18.1
Total realized/unrealized gains (losses) included in net income, net derivative assets 11.8 (0.8) (20.2)
Net purchases, sales, issuances and settlements, net derivative assets (3.4) 10.7 5.2
Transfers out of Level 3, net derivative assets (26.5)    
Ending balance, net derivative assets (5.1) 13.0 3.1
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) 9.9 5.3 (18.4)
Gross purchases, sales, issuances and settlements      
Purchases, net derivative assets (liabilities)   1.9 1.8
Sales, net derivative assets (liabilities) (3.4) 8.8 3.4
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) (3.4) 10.7 5.2
Investment and universal life contracts      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, liabilities (214.2) (45.2) (160.3)
Total realized/unrealized gains (losses) included in net income, liabilities (254.9) (145.5) 107.5
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities (0.3) (0.2) 0.1
Net purchases, sales, issuances and settlements, liabilities 1.6 (23.3) 7.5
Ending balance, liabilities (467.8) (214.2) (45.2)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (262.1) (146.0) 109.9
Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities (0.3)    
Gross purchases, sales, issuances and settlements      
Issuances, liabilities (23.0) (33.4) 2.8
Settlements, liabilities 24.6 10.1 4.7
Net purchases, sales, issuances and settlements, liabilities 1.6 (23.3) 7.5
Fixed maturities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 384.9 138.8 273.3
Total realized/unrealized gains (losses) included in net income, assets (4.5) (6.4) (5.4)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (16.7) 7.6  
Net purchases, sales, issuances and settlements, assets 263.0 237.5 197.2
Transfers into Level 3, assets 388.4 86.0 59.3
Transfers out of Level 3, assets (654.7) (78.6) (385.6)
Ending balance, assets 360.4 384.9 138.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.4) (5.5) (2.8)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 13.1    
Gross purchases, sales, issuances and settlements      
Purchases, assets 366.0 276.7 258.5
Sales, assets (5.5) (1.4) (10.1)
Settlements, assets (97.5) (37.8) (51.2)
Net purchases, sales, issuances and settlements, assets 263.0 237.5 197.2
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   0.3 3.7
Transfers out of Level 3, assets (0.3)   (3.7)
Ending balance, assets   0.3  
Gross purchases, sales, issuances and settlements      
Purchases, assets   0.5 3.7
Settlements, assets   (0.2)  
Net purchases, sales, issuances and settlements, assets   0.3 3.7
Non-U.S. governments | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets   4.6 7.4
Total realized/unrealized gains (losses) included in other comprehensive income, assets     (0.1)
Net purchases, sales, issuances and settlements, assets   (4.6) (1.4)
Transfers out of Level 3, assets     (1.3)
Ending balance, assets     4.6
Gross purchases, sales, issuances and settlements      
Settlements, assets   (4.6) (1.4)
Net purchases, sales, issuances and settlements, assets   (4.6) (1.4)
Corporate debt securities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 81.7 57.9 128.0
Total realized/unrealized gains (losses) included in net income, assets (0.9)   (1.0)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 5.2 2.5 (0.1)
Net purchases, sales, issuances and settlements, assets 118.0 17.2 (15.2)
Transfers into Level 3, assets 342.0 4.1 1.0
Transfers out of Level 3, assets (255.2)   (54.8)
Ending balance, assets 290.8 81.7 57.9
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 11.9    
Gross purchases, sales, issuances and settlements      
Purchases, assets 169.2 41.9 12.9
Sales, assets (5.5) (1.4) (10.1)
Settlements, assets (45.7) (23.3) (18.0)
Net purchases, sales, issuances and settlements, assets 118.0 17.2 (15.2)
Commercial mortgage-backed securities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 12.9 9.5 10.6
Total realized/unrealized gains (losses) included in net income, assets (1.3) (3.8) (3.5)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 1.4 3.4 0.2
Net purchases, sales, issuances and settlements, assets (0.1) 2.4 0.1
Transfers into Level 3, assets 0.3 3.7 3.6
Transfers out of Level 3, assets   (2.3) (1.5)
Ending balance, assets 13.2 12.9 9.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.2) (2.9) (1.9)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 1.5    
Gross purchases, sales, issuances and settlements      
Purchases, assets   2.4  
Settlements, assets (0.1)   0.1
Net purchases, sales, issuances and settlements, assets (0.1) 2.4 0.1
Collateralized debt obligations | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 199.0 8.3 125.0
Total realized/unrealized gains (losses) included in net income, assets (2.3) (2.6) (0.9)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (21.9) 0.9 0.2
Net purchases, sales, issuances and settlements, assets 183.0 122.5 66.3
Transfers into Level 3, assets   69.9 54.7
Transfers out of Level 3, assets (330.6)   (237.0)
Ending balance, assets 27.2 199.0 8.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (2.2) (2.6) (0.9)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.3)    
Gross purchases, sales, issuances and settlements      
Purchases, assets 182.5 124.7 93.6
Settlements, assets 0.5 (2.2) (27.3)
Net purchases, sales, issuances and settlements, assets 183.0 122.5 66.3
Other debt obligations | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 91.3 58.5 2.3
Total realized/unrealized gains (losses) included in other comprehensive income, assets (1.4) 0.8 (0.2)
Net purchases, sales, issuances and settlements, assets (37.9) 100.0 147.4
Transfers into Level 3, assets 46.1 8.3  
Transfers out of Level 3, assets (68.9) (76.3) (91.0)
Ending balance, assets 29.2 91.3 58.5
Gross purchases, sales, issuances and settlements      
Purchases, assets 14.3 107.7 152.0
Settlements, assets (52.2) (7.7) (4.6)
Net purchases, sales, issuances and settlements, assets (37.9) 100.0 147.4
Equity securities      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets     2.7
Total realized/unrealized gains (losses) included in net income, assets     12.9
Net purchases, sales, issuances and settlements, assets     (15.6)
Gross purchases, sales, issuances and settlements      
Sales, assets     (15.6)
Net purchases, sales, issuances and settlements, assets     (15.6)
Other investments      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 39.0 17.2 6.5
Total realized/unrealized gains (losses) included in net income, assets 6.3 6.0 1.7
Total realized/unrealized gains (losses) included in other comprehensive income, assets (2.9)    
Net purchases, sales, issuances and settlements, assets (10.5) 5.8 9.0
Transfers into Level 3, assets   10.0  
Ending balance, assets 31.9 39.0 17.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 5.3 6.0 1.7
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (2.9)    
Gross purchases, sales, issuances and settlements      
Purchases, assets 0.5 10.7 9.0
Sales, assets (11.0) (4.9)  
Net purchases, sales, issuances and settlements, assets (10.5) 5.8 9.0
Separate account assets      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 8,968.0 8,615.5 7,651.4
Total realized/unrealized gains (losses) included in net income, assets 463.7 739.9 869.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets     (0.3)
Net purchases, sales, issuances and settlements, assets (538.5) (214.2) 133.7
Transfers into Level 3, assets     2.3
Transfers out of Level 3, assets   (173.2) (41.1)
Ending balance, assets 8,893.2 8,968.0 8,615.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 385.5 697.1 829.8
Gross purchases, sales, issuances and settlements      
Purchases, assets 309.2 279.1 743.0
Sales, assets (658.2) (526.4) (608.4)
Issuances, assets (396.1) (280.4) (206.5)
Settlements, assets 206.6 313.5 205.6
Net purchases, sales, issuances and settlements, assets $ (538.5) $ (214.2) $ 133.7