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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets $ 14.9   $ 2.7  
Total realized/unrealized gains (losses) included in net income, assets 0.7   12.9  
Net purchases, sales, issuances and settlements, assets (15.6)   (15.6)  
Gross purchases, sales, issuances and settlements        
Sales, assets (15.6)   (15.6)  
Net purchases, sales, issuances and settlements, assets (15.6)   (15.6)  
Available-for-sale | Fixed maturities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 204.7 $ 398.5 273.3 $ 517.4
Total realized/unrealized gains (losses) included in net income, assets (0.1) (4.5) (2.0) (7.7)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.9) 6.2 0.9 8.9
Net purchases, sales, issuances and settlements, assets 113.9 (0.5) 90.2 (30.0)
Transfers into Level 3, assets 12.4 123.3 15.6 128.6
Transfers out of Level 3, assets (52.3) (62.6) (100.3) (156.8)
Ending balance, assets 277.7 460.4 277.7 460.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (4.8) (0.6) (5.0)
Gross purchases, sales, issuances and settlements        
Purchases, assets 123.2 27.6 134.5 67.4
Sales, assets   (14.0) (4.2) (69.1)
Settlements, assets (9.3) (14.1) (40.1) (28.3)
Net purchases, sales, issuances and settlements, assets 113.9 (0.5) 90.2 (30.0)
Available-for-sale | Non-U.S. governments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 7.0 66.5 7.4 62.1
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) 0.2
Net purchases, sales, issuances and settlements, assets (0.4) (1.3) (0.7) 2.9
Ending balance, assets 6.6 65.1 6.6 65.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.1)   (0.1)
Gross purchases, sales, issuances and settlements        
Purchases, assets       21.8
Sales, assets   (0.9)   (18.2)
Settlements, assets (0.4) (0.4) (0.7) (0.7)
Net purchases, sales, issuances and settlements, assets (0.4) (1.3) (0.7) 2.9
Available-for-sale | Corporate debt securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 103.8 235.3 128.0 259.1
Total realized/unrealized gains (losses) included in net income, assets   (0.1) 1.1 (1.9)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.7) (0.8) (0.3) (0.4)
Net purchases, sales, issuances and settlements, assets (6.0) (11.8) (3.6) (38.8)
Transfers into Level 3, assets 0.4 17.6 1.0 22.2
Transfers out of Level 3, assets (11.5) (37.3) (40.2) (37.3)
Ending balance, assets 86.0 202.9 86.0 202.9
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        
Purchases, assets 0.7 14.6 12.0 32.6
Sales, assets   (13.1) (4.2) (50.9)
Settlements, assets (6.7) (13.3) (11.4) (20.5)
Net purchases, sales, issuances and settlements, assets (6.0) (11.8) (3.6) (38.8)
Available-for-sale | Commercial mortgage-backed securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 11.1 62.7 10.6 71.1
Total realized/unrealized gains (losses) included in net income, assets   (4.5) (2.5) (5.7)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.1) 7.2 0.5 9.8
Net purchases, sales, issuances and settlements, assets   0.5 (0.1) (0.5)
Transfers into Level 3, assets   17.3 2.5 18.0
Transfers out of Level 3, assets (0.9) (21.7) (0.9) (31.2)
Ending balance, assets 10.1 61.5 10.1 61.5
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        
Settlements, assets   0.5 (0.1) (0.5)
Net purchases, sales, issuances and settlements, assets   0.5 (0.1) (0.5)
Available-for-sale | Collateralized debt obligations        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 80.7 27.5 125.0 33.6
Total realized/unrealized gains (losses) included in net income, assets     (0.6)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.4)   0.6 (0.7)
Net purchases, sales, issuances and settlements, assets 27.8 12.3 2.3 6.9
Transfers into Level 3, assets 12.0 88.3 12.1 88.3
Transfers out of Level 3, assets (39.9)   (59.2)  
Ending balance, assets 80.2 128.1 80.2 128.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets     (0.6)  
Gross purchases, sales, issuances and settlements        
Purchases, assets 28.1 13.0 28.1 13.0
Settlements, assets (0.3) (0.7) (25.8) (6.1)
Net purchases, sales, issuances and settlements, assets 27.8 12.3 2.3 6.9
Available-for-sale | Other debt obligations        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 2.1 6.5 2.3 91.5
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 0.3 (0.1) 0.2  
Net purchases, sales, issuances and settlements, assets 92.5 (0.2) 92.3 (0.5)
Transfers into Level 3, assets   0.1   0.1
Transfers out of Level 3, assets   (3.6)   (88.3)
Ending balance, assets 94.8 2.8 94.8 2.8
Gross purchases, sales, issuances and settlements        
Purchases, assets 94.4   94.4  
Settlements, assets (1.9) (0.2) (2.1) (0.5)
Net purchases, sales, issuances and settlements, assets 92.5 (0.2) 92.3 (0.5)
Available-for-sale | Equity securities        
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
Trading | Fixed maturities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets       92.9
Total realized/unrealized gains (losses) included in net income, assets       (2.4)
Net purchases, sales, issuances and settlements, assets 3.7   3.7 (92.4)
Transfers into Level 3, assets       1.9
Ending balance, assets 3.7   3.7  
Changes in unrealized gains (losses) included in net income relating to positions still held, assets       (0.2)
Gross purchases, sales, issuances and settlements        
Purchases, assets 3.7   3.7  
Settlements, assets       (92.4)
Net purchases, sales, issuances and settlements, assets 3.7   3.7 (92.4)
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 20.5 30.8 24.2 33.9
Total realized/unrealized gains (losses) included in net income, assets (4.9) (0.9) (11.7) (4.1)
Net purchases, sales, issuances and settlements, assets 0.4 1.7 3.5 1.8
Ending balance, assets 16.0 31.6 16.0 31.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (4.5) (0.5) (11.0) (3.8)
Gross purchases, sales, issuances and settlements        
Purchases, assets   1.9 3.1 2.2
Sales, assets 0.4 (0.2) 0.4 (0.4)
Net purchases, sales, issuances and settlements, assets 0.4 1.7 3.5 1.8
Other investments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 9.3 38.3 6.5 36.9
Total realized/unrealized gains (losses) included in net income, assets 0.3 0.7 1.8 1.9
Net purchases, sales, issuances and settlements, assets 3.6 (3.8) 4.9 (3.6)
Ending balance, assets 13.2 35.2 13.2 35.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 0.3 0.7 1.8 1.9
Gross purchases, sales, issuances and settlements        
Purchases, assets 3.6 0.3 4.9 0.5
Sales, assets   (4.1)   (4.1)
Net purchases, sales, issuances and settlements, assets 3.6 (3.8) 4.9 (3.6)
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 7,991.9 7,257.6 7,651.4 7,354.8
Total realized/unrealized gains (losses) included in net income, assets 245.4 194.4 409.8 358.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.1 (0.6) (0.6) (0.9)
Net purchases, sales, issuances and settlements, assets 54.5 (19.1) 231.3 (278.9)
Transfers into Level 3, assets   2.1   2.1
Transfers out of Level 3, assets (0.4) (21.5) (0.4) (22.4)
Ending balance, assets 8,291.5 7,412.9 8,291.5 7,412.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 257.9 168.2 402.6 323.5
Gross purchases, sales, issuances and settlements        
Purchases, assets 231.4 120.7 571.8 179.3
Sales, assets (124.1) (70.9) (228.5) (381.4)
Issuances, assets (60.0) (64.4) (105.5) (135.7)
Settlements, assets 7.2 (4.5) (6.5) 58.9
Net purchases, sales, issuances and settlements, assets 54.5 (19.1) 231.3 (278.9)
Investment contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (96.2) (119.6) (160.3) (176.5)
Total realized/unrealized gains (losses) included in net income, liabilities 52.0 (29.1) 115.7 23.5
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities (0.1) 0.2 0.1 0.3
Net purchases, sales, issuances and settlements, liabilities 1.5 1.9 1.7 6.1
Ending balance, liabilities (42.8) (146.6) (42.8) (146.6)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 51.6 (29.7) 115.3 21.6
Gross purchases, sales, issuances and settlements        
Issuances, liabilities 0.7 0.2 0.2 0.4
Settlements, liabilities 0.8 1.7 1.5 5.7
Net purchases, sales, issuances and settlements, liabilities 1.5 1.9 1.7 6.1
Derivative liabilities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (3.7) (18.1) (6.1) (22.6)
Total realized/unrealized gains (losses) included in net income, liabilities (6.2) 6.5 (4.4) 11.1
Net purchases, sales, issuances and settlements, liabilities (0.7) (1.0) (0.1) (1.1)
Ending balance, liabilities (10.6) (12.6) (10.6) (12.6)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (7.9) 6.4 (5.0) 9.5
Gross purchases, sales, issuances and settlements        
Purchases, liabilities (1.2) (1.0) (1.2) (1.2)
Sales, liabilities 0.5   1.1 0.1
Net purchases, sales, issuances and settlements, liabilities $ (0.7) $ (1.0) $ (0.1) (1.1)
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