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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Available-for-sale | Fixed maturities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets $ 398.5 $ 392.7 $ 517.4 $ 378.8
Total realized/unrealized gains (losses) included in net income, assets (4.5) (0.2) (7.7) (0.4)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 6.2 (0.8) 8.9 (1.7)
Net purchases, sales, issuances and settlements, assets (0.5) 19.5 (30.0) 38.5
Transfers into Level 3, assets 123.3 15.7 128.6 15.7
Transfers out of Level 3, assets (62.6) (32.6) (156.8) (36.6)
Ending balance, assets 460.4 394.3 460.4 394.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (4.8) (0.2) (5.0) (0.4)
Gross purchases, sales, issuances and settlements        
Purchases, assets 27.6 24.2 67.4 64.8
Sales, assets (14.0)   (69.1) (9.3)
Settlements, assets (14.1) (4.7) (28.3) (17.0)
Net purchases, sales, issuances and settlements, assets (0.5) 19.5 (30.0) 38.5
Available-for-sale | Non-U.S. governments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 66.5 97.8 62.1 79.1
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)   0.2 2.5
Net purchases, sales, issuances and settlements, assets (1.3) 2.3 2.9 18.6
Transfers out of Level 3, assets   (32.6)   (32.6)
Ending balance, assets 65.1 67.5 65.1 67.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.1)   (0.1) (0.1)
Gross purchases, sales, issuances and settlements        
Purchases, assets   2.6 21.8 19.3
Sales, assets (0.9)   (18.2)  
Settlements, assets (0.4) (0.3) (0.7) (0.7)
Net purchases, sales, issuances and settlements, assets (1.3) 2.3 2.9 18.6
Available-for-sale | Corporate debt securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 235.3 222.7 259.1 223.9
Total realized/unrealized gains (losses) included in net income, assets (0.1) (0.2) (1.9) (0.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.8) (1.1) (0.4) (3.7)
Net purchases, sales, issuances and settlements, assets (11.8) 4.6 (38.8) 7.8
Transfers into Level 3, assets 17.6 15.7 22.2 15.7
Transfers out of Level 3, assets (37.3)   (37.3) (1.7)
Ending balance, assets 202.9 241.7 202.9 241.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.2) (0.2) (0.4) (0.3)
Gross purchases, sales, issuances and settlements        
Purchases, assets 14.6 7.9 32.6 31.8
Sales, assets (13.1)   (50.9) (9.3)
Settlements, assets (13.3) (3.3) (20.5) (14.7)
Net purchases, sales, issuances and settlements, assets (11.8) 4.6 (38.8) 7.8
Available-for-sale | Commercial mortgage-backed securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 62.7 2.4 71.1 4.8
Total realized/unrealized gains (losses) included in net income, assets (4.5)   (5.7)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets 7.2   9.8  
Net purchases, sales, issuances and settlements, assets 0.5 13.1 (0.5) 13.0
Transfers into Level 3, assets 17.3   18.0  
Transfers out of Level 3, assets (21.7)   (31.2) (2.3)
Ending balance, assets 61.5 15.5 61.5 15.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (4.5)   (4.5)  
Gross purchases, sales, issuances and settlements        
Purchases, assets   13.7   13.7
Settlements, assets 0.5 (0.6) (0.5) (0.7)
Net purchases, sales, issuances and settlements, assets 0.5 13.1 (0.5) 13.0
Available-for-sale | Collateralized debt obligations        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 27.5 62.8 33.6 63.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets   0.2 (0.7) (0.5)
Net purchases, sales, issuances and settlements, assets 12.3 (0.2) 6.9 (0.2)
Transfers into Level 3, assets 88.3   88.3  
Ending balance, assets 128.1 62.8 128.1 62.8
Gross purchases, sales, issuances and settlements        
Purchases, assets 13.0   13.0  
Settlements, assets (0.7) (0.2) (6.1) (0.2)
Net purchases, sales, issuances and settlements, assets 12.3 (0.2) 6.9 (0.2)
Available-for-sale | Other debt obligations        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 6.5 7.0 91.5 7.5
Total realized/unrealized gains (losses) included in net income, assets 0.1      
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.1) 0.1    
Net purchases, sales, issuances and settlements, assets (0.2) (0.3) (0.5) (0.7)
Transfers into Level 3, assets 0.1   0.1  
Transfers out of Level 3, assets (3.6)   (88.3)  
Ending balance, assets 2.8 6.8 2.8 6.8
Gross purchases, sales, issuances and settlements        
Settlements, assets (0.2) (0.3) (0.5) (0.7)
Net purchases, sales, issuances and settlements, assets (0.2) (0.3) (0.5) (0.7)
Available-for-sale | Equity securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 2.7 4.1 2.7 4.1
Total realized/unrealized gains (losses) included in net income, assets   (1.3)   (1.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (0.1)   (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)   (1.4)
Trading | Fixed maturities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets   135.8 92.9 135.5
Total realized/unrealized gains (losses) included in net income, assets     (2.4) 0.3
Net purchases, sales, issuances and settlements, assets   (18.0) (92.4) (18.0)
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     (0.2) 0.4
Gross purchases, sales, issuances and settlements        
Sales, assets   (18.0)   (18.0)
Settlements, assets     (92.4)  
Net purchases, sales, issuances and settlements, assets   (18.0) (92.4) (18.0)
Trading | Equity securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 0.6      
Total realized/unrealized gains (losses) included in net income, assets 0.1      
Net purchases, sales, issuances and settlements, assets (0.7)   (0.7)  
Transfers into Level 3, assets     0.7  
Gross purchases, sales, issuances and settlements        
Settlements, assets (0.7)   (0.7)  
Net purchases, sales, issuances and settlements, assets (0.7)   (0.7)  
Derivative assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 30.8 59.1 33.9 47.2
Total realized/unrealized gains (losses) included in net income, assets (0.9) 1.7 (4.1) 13.2
Net purchases, sales, issuances and settlements, assets 1.7 0.3 1.8 0.7
Ending balance, assets 31.6 61.1 31.6 61.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.5) 2.4 (3.8) 14.4
Gross purchases, sales, issuances and settlements        
Purchases, assets 1.9   2.2  
Sales, assets (0.2) 0.3 (0.4) 0.7
Net purchases, sales, issuances and settlements, assets 1.7 0.3 1.8 0.7
Other investments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 38.3 35.9 36.9 35.1
Total realized/unrealized gains (losses) included in net income, assets 0.7 0.1 1.9 0.7
Net purchases, sales, issuances and settlements, assets (3.8) 0.1 (3.6) 0.3
Ending balance, assets 35.2 36.1 35.2 36.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 0.7 0.1 1.9 0.7
Gross purchases, sales, issuances and settlements        
Purchases, assets 0.3 0.1 0.5 0.3
Sales, assets (4.1)   (4.1)  
Net purchases, sales, issuances and settlements, assets (3.8) 0.1 (3.6) 0.3
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 7,257.6 7,094.5 7,354.8 7,013.9
Total realized/unrealized gains (losses) included in net income, assets 194.4 140.2 358.2 293.1
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.6)   (0.9) (0.1)
Net purchases, sales, issuances and settlements, assets (19.1) 174.2 (278.9) 101.2
Transfers into Level 3, assets 2.1 0.1 2.1 0.9
Transfers out of Level 3, assets (21.5) (0.7) (22.4) (0.7)
Ending balance, assets 7,412.9 7,408.3 7,412.9 7,408.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 168.2 95.9 323.5 305.7
Gross purchases, sales, issuances and settlements        
Purchases, assets 120.7 233.9 179.3 290.1
Sales, assets (70.9) (5.4) (381.4) (66.1)
Issuances, assets (64.4) (47.2) (135.7) (140.0)
Settlements, assets (4.5) (7.1) 58.9 17.2
Net purchases, sales, issuances and settlements, assets (19.1) 174.2 (278.9) 101.2
Investment contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (119.6) (213.0) (176.5) (177.4)
Total realized/unrealized gains (losses) included in net income, liabilities (29.1) (113.0) 23.5 (151.3)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities 0.2   0.3  
Net purchases, sales, issuances and settlements, liabilities 1.9 1.7 6.1 4.4
Ending balance, liabilities (146.6) (324.3) (146.6) (324.3)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (29.7) (114.3) 21.6 (153.4)
Gross purchases, sales, issuances and settlements        
Issuances, liabilities 0.2   0.4 1.1
Settlements, liabilities 1.7 1.7 5.7 3.3
Net purchases, sales, issuances and settlements, liabilities 1.9 1.7 6.1 4.4
Derivative liabilities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (18.1) (36.1) (22.6) (50.5)
Total realized/unrealized gains (losses) included in net income, liabilities 6.5 6.9 11.1 20.5
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities       0.5
Net purchases, sales, issuances and settlements, liabilities (1.0) 0.7 (1.1) 1.0
Ending balance, liabilities (12.6) (28.5) (12.6) (28.5)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 6.4 5.1 9.5 17.3
Gross purchases, sales, issuances and settlements        
Purchases, liabilities (1.0)   (1.2)  
Sales, liabilities   0.7 0.1 1.0
Net purchases, sales, issuances and settlements, liabilities $ (1.0) 0.7 (1.1) 1.0
Other liabilities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities   (73.1) (59.9) (68.1)
Total realized/unrealized gains (losses) included in net income, liabilities   (2.9) (0.1) (7.9)
Net purchases, sales, issuances and settlements, liabilities   17.4 60.0 17.4
Ending balance, liabilities   (58.6)   (58.6)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities   (2.4)   (6.2)
Gross purchases, sales, issuances and settlements        
Sales, liabilities   17.4   17.4
Settlements, liabilities     60.0  
Net purchases, sales, issuances and settlements, liabilities   $ 17.4 $ 60.0 $ 17.4