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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, net derivative assets $ 18.1 $ 11.3 $ (3.3)
Total realized/unrealized gains (losses) included in net income, net derivative assets (20.2) 3.1 11.3
Total realized/unrealized gains (losses) included in other comprehensive income, net derivative assets     0.5
Net purchases, sales, issuances and settlements, net derivative assets 5.2 3.7 2.8
Ending balance, net derivative assets 3.1 18.1 11.3
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (18.4) 4.9 10.4
Gross purchases, sales, issuances and settlements      
Purchases, net derivative assets (liabilities) (1.8) 1.5 0.5
Sales, net derivative assets (liabilities) 3.4 2.2 2.3
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 5.2 3.7 2.8
Investment contracts      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, liabilities (160.3) (176.5) (177.4)
Total realized/unrealized gains (losses) included in net income, liabilities 107.5 8.4 (5.9)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities 0.1 0.4  
Net purchases, sales, issuances and settlements, liabilities 7.5 7.4 6.8
Ending balance, liabilities (45.2) (160.3) (176.5)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 109.9 5.7 (12.6)
Gross purchases, sales, issuances and settlements      
Issuances, liabilities 2.8 (0.2) 1.8
Settlements, liabilities 4.7 7.6 5.0
Net purchases, sales, issuances and settlements, liabilities 7.5 7.4 6.8
Other liabilities      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, liabilities   (59.9) (68.1)
Total realized/unrealized gains (losses) included in net income, liabilities   (0.1) (9.2)
Net purchases, sales, issuances and settlements, liabilities   60.0 17.4
Ending balance, liabilities     (59.9)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities     (7.5)
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
Fixed maturities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 273.3 517.4 378.8
Total realized/unrealized gains (losses) included in net income, assets (5.4) (15.2) (10.8)
Total realized/unrealized gains (losses) included in other comprehensive income, assets   15.8 8.3
Net purchases, sales, issuances and settlements, assets 197.2 (42.4) 143.2
Transfers into Level 3, assets 59.3 232.3 51.1
Transfers out of Level 3, assets (385.6) (434.6) (53.2)
Ending balance, assets 138.8 273.3 517.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (2.8) (5.1) (10.8)
Gross purchases, sales, issuances and settlements      
Purchases, assets 258.5 202.6 226.0
Sales, assets (10.1) (174.4) (19.4)
Settlements, assets (51.2) (70.6) (63.4)
Net purchases, sales, issuances and settlements, assets 197.2 (42.4) 143.2
Fixed maturities | Trading      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets   92.9 135.5
Total realized/unrealized gains (losses) included in net income, assets   (2.4) 0.5
Net purchases, sales, issuances and settlements, assets 3.7 (92.4) (43.1)
Transfers into Level 3, assets   1.9  
Transfers out of Level 3, assets (3.7)    
Ending balance, assets     92.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets     0.1
Gross purchases, sales, issuances and settlements      
Purchases, assets 3.7    
Sales, assets     (18.0)
Settlements, assets   (92.4) (25.1)
Net purchases, sales, issuances and settlements, assets 3.7 (92.4) (43.1)
Non-U.S. governments | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 7.4 62.1 79.1
Total realized/unrealized gains (losses) included in net income, assets   (0.2) (0.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.1) (0.3) 1.4
Net purchases, sales, issuances and settlements, assets (1.4) (19.0) 14.5
Transfers out of Level 3, assets (1.3) (35.2) (32.6)
Ending balance, assets 4.6 7.4 62.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.3) (0.3)
Gross purchases, sales, issuances and settlements      
Purchases, assets   67.4 19.3
Sales, assets   (85.0) (3.4)
Settlements, assets (1.4) (1.4) (1.4)
Net purchases, sales, issuances and settlements, assets (1.4) (19.0) 14.5
Corporate debt securities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 128.0 259.1 223.9
Total realized/unrealized gains (losses) included in net income, assets (1.0) (2.3) (2.2)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.1) 3.5 (3.2)
Net purchases, sales, issuances and settlements, assets (15.2) (29.2) 26.6
Transfers into Level 3, assets 1.0 22.2 15.7
Transfers out of Level 3, assets (54.8) (125.3) (1.7)
Ending balance, assets 57.9 128.0 259.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (0.8) (2.2)
Gross purchases, sales, issuances and settlements      
Purchases, assets 12.9 112.3 66.0
Sales, assets (10.1) (89.4) (13.7)
Settlements, assets (18.0) (52.1) (25.7)
Net purchases, sales, issuances and settlements, assets (15.2) (29.2) 26.6
Commercial mortgage-backed securities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 10.6 71.1 4.8
Total realized/unrealized gains (losses) included in net income, assets (3.5) (12.7) (8.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.2 11.1 8.8
Net purchases, sales, issuances and settlements, assets 0.1 (0.7) 32.7
Transfers into Level 3, assets 3.6 26.3 35.4
Transfers out of Level 3, assets (1.5) (84.5) (2.3)
Ending balance, assets 9.5 10.6 71.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.9) (4.0) (8.3)
Gross purchases, sales, issuances and settlements      
Purchases, assets     35.7
Settlements, assets 0.1 (0.7) (3.0)
Net purchases, sales, issuances and settlements, assets 0.1 (0.7) 32.7
Collateralized debt obligations | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 125.0 33.6 63.5
Total realized/unrealized gains (losses) included in net income, assets (0.9)    
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.2 1.7 0.8
Net purchases, sales, issuances and settlements, assets 66.3 7.3 (30.7)
Transfers into Level 3, assets 54.7 183.7  
Transfers out of Level 3, assets (237.0) (101.3)  
Ending balance, assets 8.3 125.0 33.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.9)    
Gross purchases, sales, issuances and settlements      
Purchases, assets 93.6 22.9  
Settlements, assets (27.3) (15.6) (30.7)
Net purchases, sales, issuances and settlements, assets 66.3 7.3 (30.7)
Other debt obligations | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 2.3 91.5 7.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.2) (0.2) 0.5
Net purchases, sales, issuances and settlements, assets 147.4 (0.8) 100.1
Transfers into Level 3, assets   0.1  
Transfers out of Level 3, assets (91.0) (88.3) (16.6)
Ending balance, assets 58.5 2.3 91.5
Gross purchases, sales, issuances and settlements      
Purchases, assets 152.0   105.0
Sales, assets     (2.3)
Settlements, assets (4.6) (0.8) (2.6)
Net purchases, sales, issuances and settlements, assets 147.4 (0.8) 100.1
Equity securities      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 2.7    
Total realized/unrealized gains (losses) included in net income, assets 12.9    
Net purchases, sales, issuances and settlements, assets (15.6)    
Ending balance, assets   2.7  
Gross purchases, sales, issuances and settlements      
Sales, assets (15.6)    
Net purchases, sales, issuances and settlements, assets (15.6)    
Equity securities | Available-for-sale      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 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
Changes in unrealized gains (losses) included in net income relating to positions still held, assets     (1.4)
Equity securities | Trading      
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)  
Other investments      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 6.5 36.9 35.1
Total realized/unrealized gains (losses) included in net income, assets 1.7 3.9 1.5
Net purchases, sales, issuances and settlements, assets 9.0 (34.3) 0.3
Ending balance, assets 17.2 6.5 36.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 1.7 3.8 1.5
Gross purchases, sales, issuances and settlements      
Purchases, assets 9.0 2.4 0.7
Sales, assets   (36.7) (0.4)
Net purchases, sales, issuances and settlements, assets 9.0 (34.3) 0.3
Separate account assets      
Changes in Level 3 fair value measurements rollforward, assets and liabilities      
Beginning balance, assets 7,651.4 7,354.8 7,013.9
Total realized/unrealized gains (losses) included in net income, assets 869.5 798.1 718.9
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.3) (1.1)  
Net purchases, sales, issuances and settlements, assets 133.7 (464.8) (382.5)
Transfers into Level 3, assets 2.3 3.1 5.3
Transfers out of Level 3, assets (41.1) (38.7) (0.8)
Ending balance, assets 8,615.5 7,651.4 7,354.8
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 829.8 696.0 669.7
Gross purchases, sales, issuances and settlements      
Purchases, assets 743.0 401.4 528.0
Sales, assets (608.4) (651.4) (654.5)
Issuances, assets (206.5) (284.6) (345.4)
Settlements, assets 205.6 69.8 89.4
Net purchases, sales, issuances and settlements, assets $ 133.7 $ (464.8) $ (382.5)