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Fair Value Measurements (Details 2) - Recurring Fair Value Measurements - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Available-for-sale | Fixed maturities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets $ 377.3 $ 333.6 $ 412.2 $ 336.8
Total realized/unrealized gains (losses) included in net income, assets (0.1) (2.4) (0.3) (3.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (1.1) (2.7) (2.1) 1.9
Net purchases, sales, issuances and settlements, assets 26.7 50.9 58.6 51.4
Transfers into Level 3, assets 15.0 16.4 41.2 53.4
Transfers out of Level 3, assets (40.1) (17.9) (131.9) (62.3)
Ending balance, assets 377.7 377.9 377.7 377.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.2) (2.3) (0.4) (3.1)
Gross purchases, sales, issuances and settlements        
Purchases, assets 30.5 58.4 89.7 131.6
Sales, assets   (5.5) (5.7) (50.0)
Settlements, assets (3.8) (2.0) (25.4) (30.2)
Net purchases, sales, issuances and settlements, assets 26.7 50.9 58.6 51.4
Available-for-sale | Non-U.S. governments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 45.6 39.6 38.7 47.5
Total realized/unrealized gains (losses) included in net income, assets (0.1)   (0.2) (0.1)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.3 (0.2) 0.4 (0.2)
Net purchases, sales, issuances and settlements, assets 3.1 1.9 10.0 (5.9)
Ending balance, assets 48.9 41.3 48.9 41.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.1)   (0.2) (0.1)
Gross purchases, sales, issuances and settlements        
Purchases, assets 3.4 2.2 10.9 5.8
Sales, assets       (10.8)
Settlements, assets (0.3) (0.3) (0.9) (0.9)
Net purchases, sales, issuances and settlements, assets 3.1 1.9 10.0 (5.9)
Available-for-sale | States and political subdivisions        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets   1.7   1.8
Net purchases, sales, issuances and settlements, assets       (0.1)
Ending balance, assets   1.7   1.7
Gross purchases, sales, issuances and settlements        
Settlements, assets       (0.1)
Net purchases, sales, issuances and settlements, assets       (0.1)
Available-for-sale | Corporate debt securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 227.0 170.0 245.6 164.0
Total realized/unrealized gains (losses) included in net income, assets (0.1) (1.4) (0.2) (1.6)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (2.4) (2.8) (3.3) (1.7)
Net purchases, sales, issuances and settlements, assets 3.4 40.7 27.1 21.0
Transfers into Level 3, assets 15.0 15.7 41.2 46.6
Transfers out of Level 3, assets (6.1)   (73.6) (6.1)
Ending balance, assets 236.8 222.2 236.8 222.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.1) (1.4) (0.2) (1.5)
Gross purchases, sales, issuances and settlements        
Purchases, assets 5.5 46.5 47.1 64.5
Sales, assets   (5.5) (5.7) (39.2)
Settlements, assets (2.1) (0.3) (14.3) (4.3)
Net purchases, sales, issuances and settlements, assets 3.4 40.7 27.1 21.0
Available-for-sale | Commercial mortgage-backed securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets   6.7   1.6
Total realized/unrealized gains (losses) included in net income, assets   (1.0)   (1.6)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.1 0.2 0.1 1.3
Net purchases, sales, issuances and settlements, assets 15.2 0.2 15.2 (0.2)
Transfers into Level 3, assets   0.7   6.8
Transfers out of Level 3, assets   (1.4)   (2.5)
Ending balance, assets 15.3 5.4 15.3 5.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.9)   (1.5)
Gross purchases, sales, issuances and settlements        
Purchases, assets 15.2   15.2  
Settlements, assets   0.2   (0.2)
Net purchases, sales, issuances and settlements, assets 15.2 0.2 15.2 (0.2)
Available-for-sale | Collateralized debt obligations        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 63.3 68.5 64.2 37.8
Total realized/unrealized gains (losses) included in net income, assets 0.1   0.1  
Total realized/unrealized gains (losses) included in other comprehensive income, assets   0.1 (0.1) 1.4
Net purchases, sales, issuances and settlements, assets (0.2) 9.5 (1.0) 46.4
Transfers out of Level 3, assets   (16.5)   (24.0)
Ending balance, assets 63.2 61.6 63.2 61.6
Gross purchases, sales, issuances and settlements        
Purchases, assets   9.7   61.3
Settlements, assets (0.2) (0.2) (1.0) (14.9)
Net purchases, sales, issuances and settlements, assets (0.2) 9.5 (1.0) 46.4
Available-for-sale | Other debt obligations        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 41.4 47.1 63.7 84.1
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.9   0.8 1.1
Net purchases, sales, issuances and settlements, assets 5.2 (1.4) 7.3 (9.8)
Transfers out of Level 3, assets (34.0)   (58.3) (29.7)
Ending balance, assets 13.5 45.7 13.5 45.7
Gross purchases, sales, issuances and settlements        
Purchases, assets 6.4   16.5  
Settlements, assets (1.2) (1.4) (9.2) (9.8)
Net purchases, sales, issuances and settlements, assets 5.2 (1.4) 7.3 (9.8)
Available-for-sale | Equity securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 4.1 17.5 4.1 16.9
Total realized/unrealized gains (losses) included in net income, assets   (0.3)   (0.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets   0.2   0.6
Transfers into Level 3, assets       0.2
Ending balance, assets 4.1 17.4 4.1 17.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.3)   (0.3)
Trading | Fixed maturities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 139.8 159.6 139.7 169.9
Total realized/unrealized gains (losses) included in net income, assets (0.8) 3.7 (0.6) 9.5
Net purchases, sales, issuances and settlements, assets   (24.0) (0.1) (40.1)
Ending balance, assets 139.0 139.3 139.0 139.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.8) 0.2 (0.7) 0.8
Gross purchases, sales, issuances and settlements        
Sales, assets   (10.0) (0.2) (10.0)
Settlements, assets   (14.0) 0.1 (30.1)
Net purchases, sales, issuances and settlements, assets   (24.0) (0.1) (40.1)
Derivative assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 45.1 62.3 53.7 74.2
Total realized/unrealized gains (losses) included in net income, assets 7.4 (14.4) (3.6) (26.4)
Net purchases, sales, issuances and settlements, assets   9.8 2.4 9.9
Ending balance, assets 52.5 57.7 52.5 57.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 7.4 (14.3) (3.4) (26.4)
Gross purchases, sales, issuances and settlements        
Purchases, assets   9.8 2.5 9.9
Sales, assets     (0.1)  
Net purchases, sales, issuances and settlements, assets   9.8 2.4 9.9
Other investments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 29.7 134.6 127.2 142.9
Total realized/unrealized gains (losses) included in net income, assets 0.5 3.8 4.5 6.6
Net purchases, sales, issuances and settlements, assets 1.3 (14.1) (65.2) (25.2)
Transfers out of Level 3, assets     (35.0)  
Ending balance, assets 31.5 124.3 31.5 124.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 0.5 3.8 4.5 6.6
Gross purchases, sales, issuances and settlements        
Purchases, assets 1.3   2.5 0.2
Sales, assets     (67.7)  
Settlements, assets   (14.1)   (25.4)
Net purchases, sales, issuances and settlements, assets 1.3 (14.1) (65.2) (25.2)
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 6,406.0 5,533.6 5,891.4 5,265.2
Total realized/unrealized gains (losses) included in net income, assets 344.4 167.0 799.3 358.4
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (0.3)   (0.2)
Net purchases, sales, issuances and settlements, assets (14.3) 79.0 45.4 161.3
Transfers into Level 3, assets 0.1 2.3 0.2 4.4
Transfers out of Level 3, assets (0.1) (4.2) (0.2) (11.7)
Ending balance, assets 6,736.1 5,777.4 6,736.1 5,777.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 267.5 163.7 705.2 359.9
Gross purchases, sales, issuances and settlements        
Purchases, assets 69.6 228.5 430.6 467.2
Sales, assets (29.7) (127.3) (189.1) (257.5)
Issuances, assets (54.7) (196.5) (200.5) (290.1)
Settlements, assets 0.5 174.3 4.4 241.7
Net purchases, sales, issuances and settlements, assets (14.3) 79.0 45.4 161.3
Investment-type insurance contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (117.0) (37.6) (176.4) (6.9)
Total realized/unrealized gains (losses) included in net income, liabilities (98.1) (62.8) (40.5) (109.9)
Net purchases, sales, issuances and settlements, liabilities 4.8 6.3 6.6 22.7
Ending balance, liabilities (210.3) (94.1) (210.3) (94.1)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (98.9) (56.1) (43.8) (109.9)
Gross purchases, sales, issuances and settlements        
Issuances, liabilities 3.7 4.2 1.4 18.7
Settlements, liabilities 1.1 2.1 5.2 4.0
Net purchases, sales, issuances and settlements, liabilities 4.8 6.3 6.6 22.7
Derivative liabilities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (37.0) (24.7) (35.5) (39.6)
Total realized/unrealized gains (losses) included in net income, liabilities (9.1) (13.3) (12.0) 0.5
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities 0.4 (0.6) 1.6 0.7
Net purchases, sales, issuances and settlements, liabilities   0.8 0.2 0.6
Ending balance, liabilities (45.7) (37.8) (45.7) (37.8)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (9.5) (14.5) (12.6) (3.7)
Gross purchases, sales, issuances and settlements        
Purchases, liabilities   (0.6)   (0.8)
Sales, liabilities   1.4 0.2 1.4
Net purchases, sales, issuances and settlements, liabilities   0.8 0.2 0.6
Other liabilities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (67.5) (79.9) (66.3) (73.9)
Total realized/unrealized gains (losses) included in net income, liabilities 2.8 9.9 1.6 3.9
Net purchases, sales, issuances and settlements, liabilities   9.0   9.0
Ending balance, liabilities (64.7) (61.0) (64.7) (61.0)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities $ 2.8 9.8 $ 1.5 4.5
Gross purchases, sales, issuances and settlements        
Sales, liabilities   9.0   9.0
Net purchases, sales, issuances and settlements, liabilities   $ 9.0   $ 9.0