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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Available-for-sale | Fixed maturities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets $ 460.4 $ 394.3 $ 517.4 $ 378.8
Total realized/unrealized gains (losses) included in net income, assets (4.5) (0.4) (12.2) (0.8)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 8.5 0.8 17.4 (0.9)
Net purchases, sales, issuances and settlements, assets 26.9 32.4 (3.1) 70.9
Transfers into Level 3, assets 61.5   190.1 15.7
Transfers out of Level 3, assets (77.3)   (234.1) (36.6)
Ending balance, assets 475.5 427.1 475.5 427.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (4.3) (0.2) (4.8) (0.8)
Gross purchases, sales, issuances and settlements        
Purchases, assets 94.1 53.9 161.5 118.7
Sales, assets (37.5) (4.8) (106.6) (14.1)
Settlements, assets (29.7) (16.7) (58.0) (33.7)
Net purchases, sales, issuances and settlements, assets 26.9 32.4 (3.1) 70.9
Available-for-sale | Non-U.S. governments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 65.1 67.5 62.1 79.1
Total realized/unrealized gains (losses) included in net income, assets (0.1) (0.1) (0.2) (0.2)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.1) 0.2 0.1 2.7
Net purchases, sales, issuances and settlements, assets (10.7) (3.8) (7.8) 14.8
Transfers out of Level 3, assets       (32.6)
Ending balance, assets 54.2 63.8 54.2 63.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.1) (0.1) (0.2) (0.2)
Gross purchases, sales, issuances and settlements        
Purchases, assets 18.9   40.7 19.3
Sales, assets (29.3) (3.4) (47.5) (3.4)
Settlements, assets (0.3) (0.4) (1.0) (1.1)
Net purchases, sales, issuances and settlements, assets (10.7) (3.8) (7.8) 14.8
Available-for-sale | Corporate debt securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 202.9 241.7 259.1 223.9
Total realized/unrealized gains (losses) included in net income, assets (0.3) (0.3) (2.2) (0.6)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 3.7 (0.4) 3.3 (4.1)
Net purchases, sales, issuances and settlements, assets 35.8 18.1 (3.0) 25.9
Transfers into Level 3, assets     22.2 15.7
Transfers out of Level 3, assets     (37.3) (1.7)
Ending balance, assets 242.1 259.1 242.1 259.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.2) (0.1) (0.6) (0.6)
Gross purchases, sales, issuances and settlements        
Purchases, assets 65.3 22.6 97.9 54.4
Sales, assets (8.2) (1.4) (59.1) (10.7)
Settlements, assets (21.3) (3.1) (41.8) (17.8)
Net purchases, sales, issuances and settlements, assets 35.8 18.1 (3.0) 25.9
Available-for-sale | Commercial mortgage-backed securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 61.5 15.5 71.1 4.8
Total realized/unrealized gains (losses) included in net income, assets (4.1)   (9.8)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets 1.4 0.7 11.2 0.7
Net purchases, sales, issuances and settlements, assets (0.2) 10.0 (0.7) 23.0
Transfers into Level 3, assets 6.1   24.1  
Transfers out of Level 3, assets (50.0)   (81.2) (2.3)
Ending balance, assets 14.7 26.2 14.7 26.2
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        
Purchases, assets   11.3   25.0
Settlements, assets (0.2) (1.3) (0.7) (2.0)
Net purchases, sales, issuances and settlements, assets (0.2) 10.0 (0.7) 23.0
Available-for-sale | Collateralized debt obligations        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 128.1 62.8 33.6 63.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets 3.5 (0.1) 2.8 (0.6)
Net purchases, sales, issuances and settlements, assets 2.2 (10.5) 9.1 (10.7)
Transfers into Level 3, assets 55.4   143.7  
Transfers out of Level 3, assets (27.3)   (27.3)  
Ending balance, assets 161.9 52.2 161.9 52.2
Gross purchases, sales, issuances and settlements        
Purchases, assets 9.9   22.9  
Settlements, assets (7.7) (10.5) (13.8) (10.7)
Net purchases, sales, issuances and settlements, assets 2.2 (10.5) 9.1 (10.7)
Available-for-sale | Other debt obligations        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 2.8 6.8 91.5 7.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets   0.4   0.4
Net purchases, sales, issuances and settlements, assets (0.2) 18.6 (0.7) 17.9
Transfers into Level 3, assets     0.1  
Transfers out of Level 3, assets     (88.3)  
Ending balance, assets 2.6 25.8 2.6 25.8
Gross purchases, sales, issuances and settlements        
Purchases, assets   20.0   20.0
Settlements, assets (0.2) (1.4) (0.7) (2.1)
Net purchases, sales, issuances and settlements, assets (0.2) 18.6 (0.7) 17.9
Available-for-sale | Equity securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 2.7 2.7 2.7 4.1
Total realized/unrealized gains (losses) included in net income, assets       (1.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets       (0.1)
Ending balance, assets 2.7 2.7 2.7 2.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets       (1.4)
Trading | Fixed maturities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets   117.8 92.9 135.5
Total realized/unrealized gains (losses) included in net income, assets   0.1 (2.4) 0.4
Net purchases, sales, issuances and settlements, assets   (0.1) (92.4) (18.1)
Transfers into Level 3, assets     1.9  
Ending balance, assets   117.8   117.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.1)   0.4
Gross purchases, sales, issuances and settlements        
Sales, assets       (18.0)
Settlements, assets   (0.1) (92.4) (0.1)
Net purchases, sales, issuances and settlements, assets   (0.1) (92.4) (18.1)
Trading | Equity securities        
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 31.6 61.1 33.9 47.2
Total realized/unrealized gains (losses) included in net income, assets (3.0) (4.2) (7.1) 9.0
Net purchases, sales, issuances and settlements, assets 0.7 0.5 2.5 1.2
Ending balance, assets 29.3 57.4 29.3 57.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (2.4) (3.9) (6.0) 10.5
Gross purchases, sales, issuances and settlements        
Purchases, assets 0.3 0.3 2.5 0.3
Sales, assets 0.4 0.2   0.9
Net purchases, sales, issuances and settlements, assets 0.7 0.5 2.5 1.2
Other investments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 35.2 36.1 36.9 35.1
Total realized/unrealized gains (losses) included in net income, assets (0.4) 0.6 1.5 1.3
Net purchases, sales, issuances and settlements, assets 0.1 0.1 (3.5) 0.4
Ending balance, assets 34.9 36.8 34.9 36.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.3) 0.7 1.6 1.4
Gross purchases, sales, issuances and settlements        
Purchases, assets 0.1 0.1 0.6 0.4
Sales, assets     (4.1)  
Net purchases, sales, issuances and settlements, assets 0.1 0.1 (3.5) 0.4
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 7,412.9 7,408.3 7,354.8 7,013.9
Total realized/unrealized gains (losses) included in net income, assets 234.9 233.5 593.1 526.6
Total realized/unrealized gains (losses) included in other comprehensive income, assets     (0.9) (0.1)
Net purchases, sales, issuances and settlements, assets (171.0) (39.3) (449.9) 61.9
Transfers into Level 3, assets 0.5   2.6 0.9
Transfers out of Level 3, assets (14.0) (0.1) (36.4) (0.8)
Ending balance, assets 7,463.3 7,602.4 7,463.3 7,602.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 183.1 196.9 510.3 495.3
Gross purchases, sales, issuances and settlements        
Purchases, assets 79.7 109.0 259.0 399.1
Sales, assets (193.8) (86.5) (575.2) (152.6)
Issuances, assets (61.1) (140.0) (196.8) (280.0)
Settlements, assets 4.2 78.2 63.1 95.4
Net purchases, sales, issuances and settlements, assets (171.0) (39.3) (449.9) 61.9
Investment contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (146.6) (324.3) (176.5) (177.4)
Total realized/unrealized gains (losses) included in net income, liabilities 8.0 (2.7) 31.5 (154.0)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities     0.3  
Net purchases, sales, issuances and settlements, liabilities 0.4 0.6 6.5 5.0
Ending balance, liabilities (138.2) (326.4) (138.2) (326.4)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 7.6 (4.7) 28.9 (158.3)
Gross purchases, sales, issuances and settlements        
Issuances, liabilities (0.3) (0.6) 0.1 0.5
Settlements, liabilities 0.7 1.2 6.4 4.5
Net purchases, sales, issuances and settlements, liabilities 0.4 0.6 6.5 5.0
Derivative liabilities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (12.6) (28.5) (22.6) (50.5)
Total realized/unrealized gains (losses) included in net income, liabilities 4.4 9.8 15.5 30.3
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities       0.5
Net purchases, sales, issuances and settlements, liabilities 0.5   (0.6) 1.0
Ending balance, liabilities (7.7) (18.7) (7.7) (18.7)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 4.3 9.7 13.7 27.1
Gross purchases, sales, issuances and settlements        
Purchases, liabilities     (1.2)  
Sales, liabilities 0.5   0.6 1.0
Net purchases, sales, issuances and settlements, liabilities $ 0.5   (0.6) 1.0
Other liabilities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities   (58.6) (59.9) (68.1)
Total realized/unrealized gains (losses) included in net income, liabilities   (1.6) (0.1) (9.5)
Net purchases, sales, issuances and settlements, liabilities     60.0 17.4
Ending balance, liabilities   (60.2)   (60.2)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities   $ (1.6)   (7.8)
Gross purchases, sales, issuances and settlements        
Sales, liabilities       17.4
Settlements, liabilities     60.0  
Net purchases, sales, issuances and settlements, liabilities     $ 60.0 $ 17.4