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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investment contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities $ (42.8) $ (146.6) $ (160.3) $ (176.5)
Total realized/unrealized gains (losses) included in net income, liabilities 122.0 8.0 237.7 31.5
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities (0.1)     0.3
Net purchases, sales, issuances and settlements, liabilities 2.8 0.4 4.5 6.5
Ending balance, liabilities 81.9 (138.2) 81.9 (138.2)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 121.6 7.6 237.7 28.9
Gross purchases, sales, issuances and settlements        
Issuances, liabilities 1.4 (0.3) 1.6 0.1
Settlements, liabilities 1.4 0.7 2.9 6.4
Net purchases, sales, issuances and settlements, liabilities 2.8 0.4 4.5 6.5
Derivative liabilities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (10.6) (12.6) (6.1) (22.6)
Total realized/unrealized gains (losses) included in net income, liabilities (1.3) 4.4 (5.7) 15.5
Net purchases, sales, issuances and settlements, liabilities 0.6 0.5 0.5 (0.6)
Ending balance, liabilities (11.3) (7.7) (11.3) (7.7)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (1.4) 4.3 (5.9) 13.7
Gross purchases, sales, issuances and settlements        
Purchases, liabilities (0.1)   (1.3) (1.2)
Sales, liabilities 0.7 0.5 1.8 0.6
Net purchases, sales, issuances and settlements, liabilities 0.6 0.5 0.5 (0.6)
Other liabilities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities       (59.9)
Total realized/unrealized gains (losses) included in net income, liabilities       (0.1)
Net purchases, sales, issuances and settlements, liabilities       60.0
Gross purchases, sales, issuances and settlements        
Settlements, liabilities       60.0
Net purchases, sales, issuances and settlements, liabilities       60.0
Fixed maturities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 277.7 460.4 273.3 517.4
Total realized/unrealized gains (losses) included in net income, assets (1.0) (4.5) (3.0) (12.2)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.8) 8.5 0.1 17.4
Net purchases, sales, issuances and settlements, assets 55.8 26.9 146.0 (3.1)
Transfers into Level 3, assets 42.5 61.5 58.1 190.1
Transfers out of Level 3, assets (127.8) (77.3) (228.1) (234.1)
Ending balance, assets 246.4 475.5 246.4 475.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.1) (4.3) (1.7) (4.8)
Gross purchases, sales, issuances and settlements        
Purchases, assets 70.5 94.1 205.0 161.5
Sales, assets (5.7) (37.5) (9.9) (106.6)
Settlements, assets (9.0) (29.7) (49.1) (58.0)
Net purchases, sales, issuances and settlements, assets 55.8 26.9 146.0 (3.1)
Fixed maturities | Trading        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 3.7     92.9
Total realized/unrealized gains (losses) included in net income, assets       (2.4)
Net purchases, sales, issuances and settlements, assets     3.7 (92.4)
Transfers into Level 3, assets       1.9
Transfers out of Level 3, assets (3.7)   (3.7)  
Gross purchases, sales, issuances and settlements        
Purchases, assets     3.7  
Settlements, assets       (92.4)
Net purchases, sales, issuances and settlements, assets     3.7 (92.4)
Non-U.S. governments | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 6.6 65.1 7.4 62.1
Total realized/unrealized gains (losses) included in net income, assets   (0.1)   (0.2)
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (0.1) (0.1) 0.1
Net purchases, sales, issuances and settlements, assets (0.4) (10.7) (1.1) (7.8)
Transfers out of Level 3, assets (1.3)   (1.3)  
Ending balance, assets 4.9 54.2 4.9 54.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.1)   (0.2)
Gross purchases, sales, issuances and settlements        
Purchases, assets   18.9   40.7
Sales, assets   (29.3)   (47.5)
Settlements, assets (0.4) (0.3) (1.1) (1.0)
Net purchases, sales, issuances and settlements, assets (0.4) (10.7) (1.1) (7.8)
Corporate debt securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 86.0 202.9 128.0 259.1
Total realized/unrealized gains (losses) included in net income, assets (0.8) (0.3) 0.3 (2.2)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.2 3.7 (0.1) 3.3
Net purchases, sales, issuances and settlements, assets (11.2) 35.8 (14.8) (3.0)
Transfers into Level 3, assets     1.0 22.2
Transfers out of Level 3, assets (9.5)   (49.7) (37.3)
Ending balance, assets 64.7 242.1 64.7 242.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.0) (0.2) (1.0) (0.6)
Gross purchases, sales, issuances and settlements        
Purchases, assets 0.6 65.3 12.6 97.9
Sales, assets (5.7) (8.2) (9.9) (59.1)
Settlements, assets (6.1) (21.3) (17.5) (41.8)
Net purchases, sales, issuances and settlements, assets (11.2) 35.8 (14.8) (3.0)
Commercial mortgage-backed securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 10.1 61.5 10.6 71.1
Total realized/unrealized gains (losses) included in net income, assets   (4.1) (2.5) (9.8)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.3) 1.4 0.2 11.2
Net purchases, sales, issuances and settlements, assets   (0.2) (0.1) (0.7)
Transfers into Level 3, assets   6.1 2.5 24.1
Transfers out of Level 3, assets   (50.0) (0.9) (81.2)
Ending balance, assets 9.8 14.7 9.8 14.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (4.0)   (4.0)
Gross purchases, sales, issuances and settlements        
Settlements, assets   (0.2) (0.1) (0.7)
Net purchases, sales, issuances and settlements, assets   (0.2) (0.1) (0.7)
Collateralized debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 80.2 128.1 125.0 33.6
Total realized/unrealized gains (losses) included in net income, assets (0.2)   (0.8)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.2) 3.5 0.4 2.8
Net purchases, sales, issuances and settlements, assets 64.4 2.2 66.7 9.1
Transfers into Level 3, assets 42.5 55.4 54.6 143.7
Transfers out of Level 3, assets (68.1) (27.3) (127.3) (27.3)
Ending balance, assets 118.6 161.9 118.6 161.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.1)   (0.7)  
Gross purchases, sales, issuances and settlements        
Purchases, assets 65.5 9.9 93.6 22.9
Settlements, assets (1.1) (7.7) (26.9) (13.8)
Net purchases, sales, issuances and settlements, assets 64.4 2.2 66.7 9.1
Other debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 94.8 2.8 2.3 91.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.5)   (0.3)  
Net purchases, sales, issuances and settlements, assets 3.0 (0.2) 95.3 (0.7)
Transfers into Level 3, assets       0.1
Transfers out of Level 3, assets (48.9)   (48.9) (88.3)
Ending balance, assets 48.4 2.6 48.4 2.6
Gross purchases, sales, issuances and settlements        
Purchases, assets 4.4   98.8  
Settlements, assets (1.4) (0.2) (3.5) (0.7)
Net purchases, sales, issuances and settlements, assets 3.0 (0.2) 95.3 (0.7)
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)  
Equity securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets   2.7   2.7
Ending balance, assets   2.7   2.7
Equity securities | Trading        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Net purchases, sales, issuances and settlements, assets       (0.7)
Transfers into Level 3, assets       0.7
Gross purchases, sales, issuances and settlements        
Settlements, assets       (0.7)
Net purchases, sales, issuances and settlements, assets       (0.7)
Derivative assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 16.0 31.6 24.2 33.9
Total realized/unrealized gains (losses) included in net income, assets (3.9) (3.0) (15.6) (7.1)
Net purchases, sales, issuances and settlements, assets 0.2 0.7 3.7 2.5
Ending balance, assets 12.3 29.3 12.3 29.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.6) (2.4) (14.4) (6.0)
Gross purchases, sales, issuances and settlements        
Purchases, assets   0.3 3.1 2.5
Sales, assets 0.2 0.4 0.6  
Net purchases, sales, issuances and settlements, assets 0.2 0.7 3.7 2.5
Other investments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 13.2 35.2 6.5 36.9
Total realized/unrealized gains (losses) included in net income, assets (0.1) (0.4) 1.7 1.5
Net purchases, sales, issuances and settlements, assets 4.1 0.1 9.0 (3.5)
Ending balance, assets 17.2 34.9 17.2 34.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.3) 1.8 1.6
Gross purchases, sales, issuances and settlements        
Purchases, assets 4.1 0.1 9.0 0.6
Sales, assets       (4.1)
Net purchases, sales, issuances and settlements, assets 4.1 0.1 9.0 (3.5)
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 8,291.5 7,412.9 7,651.4 7,354.8
Total realized/unrealized gains (losses) included in net income, assets 315.6 234.9 725.4 593.1
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.4   (0.2) (0.9)
Net purchases, sales, issuances and settlements, assets (88.4) (171.0) 142.9 (449.9)
Transfers into Level 3, assets 2.3 0.5 2.3 2.6
Transfers out of Level 3, assets (36.2) (14.0) (36.6) (36.4)
Ending balance, assets 8,485.2 7,463.3 8,485.2 7,463.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 304.4 183.1 696.0 510.3
Gross purchases, sales, issuances and settlements        
Purchases, assets 42.0 79.7 613.8 259.0
Sales, assets (276.0) (193.8) (504.5) (575.2)
Issuances, assets (28.0) (61.1) (133.5) (196.8)
Settlements, assets 173.6 4.2 167.1 63.1
Net purchases, sales, issuances and settlements, assets $ (88.4) $ (171.0) $ 142.9 $ (449.9)