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Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale | Fixed maturities      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets $ 517.4 $ 378.8 $ 412.2
Total realized/unrealized gains (losses) included in net income, assets (15.2) (10.8) (0.4)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 15.8 8.3 (4.1)
Net purchases, sales, issuances and settlements, assets (42.4) 143.2 87.4
Transfers into Level 3, assets 232.3 51.1 42.8
Transfers out of Level 3, assets (434.6) (53.2) (159.1)
Ending balance, assets 273.3 517.4 378.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (5.1) (10.8) (0.6)
Gross purchases, sales, issuances and settlements      
Purchases, assets 202.6 226.0 124.1
Sales, assets (174.4) (19.4) (7.8)
Settlements, assets (70.6) (63.4) (28.9)
Net purchases, sales, issuances and settlements, assets (42.4) 143.2 87.4
Available-for-sale | Non-U.S. governments      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 62.1 79.1 38.7
Total realized/unrealized gains (losses) included in net income, assets (0.2) (0.3) (0.2)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.3) 1.4 (0.4)
Net purchases, sales, issuances and settlements, assets (19.0) 14.5 41.0
Transfers out of Level 3, assets (35.2) (32.6)  
Ending balance, assets 7.4 62.1 79.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.3) (0.3) (0.2)
Gross purchases, sales, issuances and settlements      
Purchases, assets 67.4 19.3 42.4
Sales, assets (85.0) (3.4) (0.1)
Settlements, assets (1.4) (1.4) (1.3)
Net purchases, sales, issuances and settlements, assets (19.0) 14.5 41.0
Available-for-sale | Corporate debt securities      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 259.1 223.9 245.6
Total realized/unrealized gains (losses) included in net income, assets (2.3) (2.2) (0.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 3.5 (3.2) (4.4)
Net purchases, sales, issuances and settlements, assets (29.2) 26.6 27.7
Transfers into Level 3, assets 22.2 15.7 42.8
Transfers out of Level 3, assets (125.3) (1.7) (87.5)
Ending balance, assets 128.0 259.1 223.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.8) (2.2) (0.4)
Gross purchases, sales, issuances and settlements      
Purchases, assets 112.3 66.0 52.8
Sales, assets (89.4) (13.7) (7.7)
Settlements, assets (52.1) (25.7) (17.4)
Net purchases, sales, issuances and settlements, assets (29.2) 26.6 27.7
Available-for-sale | Commercial mortgage-backed securities      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 71.1 4.8  
Total realized/unrealized gains (losses) included in net income, assets (12.7) (8.3) 0.1
Total realized/unrealized gains (losses) included in other comprehensive income, assets 11.1 8.8  
Net purchases, sales, issuances and settlements, assets (0.7) 32.7 12.3
Transfers into Level 3, assets 26.3 35.4  
Transfers out of Level 3, assets (84.5) (2.3) (7.6)
Ending balance, assets 10.6 71.1 4.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (4.0) (8.3)  
Gross purchases, sales, issuances and settlements      
Purchases, assets   35.7 12.4
Settlements, assets (0.7) (3.0) (0.1)
Net purchases, sales, issuances and settlements, assets (0.7) 32.7 12.3
Available-for-sale | Collateralized debt obligations      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 33.6 63.5 64.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets 1.7 0.8 (0.1)
Net purchases, sales, issuances and settlements, assets 7.3 (30.7) (0.6)
Transfers into Level 3, assets 183.7    
Transfers out of Level 3, assets (101.3)    
Ending balance, assets 125.0 33.6 63.5
Gross purchases, sales, issuances and settlements      
Purchases, assets 22.9    
Settlements, assets (15.6) (30.7) (0.6)
Net purchases, sales, issuances and settlements, assets 7.3 (30.7) (0.6)
Available-for-sale | Other debt obligations      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 91.5 7.5 63.7
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.2) 0.5 0.8
Net purchases, sales, issuances and settlements, assets (0.8) 100.1 7.0
Transfers into Level 3, assets 0.1    
Transfers out of Level 3, assets (88.3) (16.6) (64.0)
Ending balance, assets 2.3 91.5 7.5
Gross purchases, sales, issuances and settlements      
Purchases, assets   105.0 16.5
Sales, assets   (2.3)  
Settlements, assets (0.8) (2.6) (9.5)
Net purchases, sales, issuances and settlements, assets (0.8) 100.1 7.0
Available-for-sale | Equity portfolios      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 2.7 4.1 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 4.1
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 92.9 135.5 139.7
Total realized/unrealized gains (losses) included in net income, assets (2.4) 0.5 (4.0)
Net purchases, sales, issuances and settlements, assets (92.4) (43.1) (0.2)
Transfers into Level 3, assets 1.9    
Ending balance, assets   92.9 135.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   0.1 (4.2)
Gross purchases, sales, issuances and settlements      
Sales, assets   (18.0) (0.2)
Settlements, assets (92.4) (25.1)  
Net purchases, sales, issuances and settlements, assets (92.4) (43.1) (0.2)
Trading | Equity portfolios      
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 33.9 47.2 53.7
Total realized/unrealized gains (losses) included in net income, assets (12.8) (15.1) (8.7)
Net purchases, sales, issuances and settlements, assets 3.1 1.8 2.2
Ending balance, assets 24.2 33.9 47.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (9.0) (12.8) (8.5)
Gross purchases, sales, issuances and settlements      
Purchases, assets 2.7 0.5 2.5
Sales, assets 0.4 1.3 (0.3)
Net purchases, sales, issuances and settlements, assets 3.1 1.8 2.2
Other investments      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 36.9 35.1 127.2
Total realized/unrealized gains (losses) included in net income, assets 3.9 1.5 7.3
Net purchases, sales, issuances and settlements, assets (34.3) 0.3 (64.4)
Transfers out of Level 3, assets     (35.0)
Ending balance, assets 6.5 36.9 35.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 3.8 1.5 7.2
Gross purchases, sales, issuances and settlements      
Purchases, assets 2.4 0.7 4.4
Sales, assets (36.7) (0.4) (68.8)
Net purchases, sales, issuances and settlements, assets (34.3) 0.3 (64.4)
Separate account assets      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 7,354.8 7,013.9 5,891.4
Total realized/unrealized gains (losses) included in net income, assets 798.1 718.9 1,054.8
Total realized/unrealized gains (losses) included in other comprehensive income, assets (1.1)    
Net purchases, sales, issuances and settlements, assets (464.8) (382.5) 59.5
Transfers into Level 3, assets 3.1 5.3 8.5
Transfers out of Level 3, assets (38.7) (0.8) (0.3)
Ending balance, assets 7,651.4 7,354.8 7,013.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 696.0 669.7 850.3
Gross purchases, sales, issuances and settlements      
Purchases, assets 401.4 528.0 796.9
Sales, assets (651.4) (654.5) (436.5)
Issuances, assets (284.6) (345.4) (323.4)
Settlements, assets 69.8 89.4 22.5
Net purchases, sales, issuances and settlements, assets (464.8) (382.5) 59.5
Investment contracts      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, liabilities (176.5) (177.4) (176.4)
Total realized/unrealized gains (losses) included in net income, liabilities 8.4 (5.9) (13.4)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities 0.4    
Net purchases, sales, issuances and settlements, liabilities 7.4 6.8 12.4
Ending balance, liabilities (160.3) (176.5) (177.4)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 5.7 (12.6) (17.8)
Gross purchases, sales, issuances and settlements      
Issuances, liabilities (0.2) 1.8 5.1
Settlements, liabilities 7.6 5.0 7.3
Net purchases, sales, issuances and settlements, liabilities 7.4 6.8 12.4
Derivative liabilities      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, liabilities (22.6) (50.5) (35.5)
Total realized/unrealized gains (losses) included in net income, liabilities 15.9 26.4 (17.4)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities   0.5 2.2
Net purchases, sales, issuances and settlements, liabilities 0.6 1.0 0.2
Ending balance, liabilities (6.1) (22.6) (50.5)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 13.9 23.2 (18.0)
Gross purchases, sales, issuances and settlements      
Purchases, liabilities (1.2)    
Sales, liabilities 1.8 1.0 0.2
Net purchases, sales, issuances and settlements, liabilities 0.6 1.0 0.2
Other liabilities      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, liabilities (59.9) (68.1) (66.3)
Total realized/unrealized gains (losses) included in net income, liabilities (0.1) (9.2) (1.8)
Net purchases, sales, issuances and settlements, liabilities 60.0 17.4  
Ending balance, liabilities   (59.9) (68.1)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities   (7.5) $ (1.9)
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