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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, net derivative assets $ 3.4 $ 16.8 $ 3.1 $ 18.1
Total realized/unrealized gains (losses) included in net income, net derivative assets 6.6 (11.1) 5.0 (16.1)
Net purchases, sales, issuances and settlements, net derivative assets 5.8 (0.3) 7.7 3.4
Ending balance, net derivative assets 15.8 5.4 15.8 5.4
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets 11.2 (12.4) 8.9 (16.0)
Gross purchases, sales, issuances and settlements        
Purchases, net derivative assets (liabilities)   (1.2)   1.9
Sales, net derivative assets (liabilities) 5.8 0.9 7.7 1.5
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 5.8 (0.3) 7.7 3.4
Investment contracts        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, liabilities (40.5) (96.2) (45.2) (160.3)
Total realized/unrealized gains (losses) included in net income, liabilities (76.2) 52.0 (71.9) 115.7
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities (0.2) (0.1) (0.1) 0.1
Net purchases, sales, issuances and settlements, liabilities (1.8) 1.5 (1.5) 1.7
Ending balance, liabilities (118.7) (42.8) (118.7) (42.8)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (75.5) 51.6 (70.3) 115.3
Gross purchases, sales, issuances and settlements        
Issuances, liabilities (3.5) 0.7 (4.8) 0.2
Settlements, liabilities 1.7 0.8 3.3 1.5
Net purchases, sales, issuances and settlements, liabilities (1.8) 1.5 (1.5) 1.7
Fixed maturities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 124.0 204.7 138.8 273.3
Total realized/unrealized gains (losses) included in net income, assets (3.2) (0.1) (5.7) (2.0)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 3.9 (0.9) 5.5 0.9
Net purchases, sales, issuances and settlements, assets 0.3 113.9 12.4 90.2
Transfers into Level 3, assets 33.7 12.4 33.7 15.6
Transfers out of Level 3, assets (2.3) (52.3) (28.3) (100.3)
Ending balance, assets 156.4 277.7 156.4 277.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (2.1)   (4.6) (0.6)
Gross purchases, sales, issuances and settlements        
Purchases, assets 22.0 123.2 34.9 134.5
Sales, assets (0.2)   (0.4) (4.2)
Settlements, assets (21.5) (9.3) (22.1) (40.1)
Net purchases, sales, issuances and settlements, assets 0.3 113.9 12.4 90.2
Fixed maturities | Trading        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Net purchases, sales, issuances and settlements, assets 0.5 3.7 0.5 3.7
Ending balance, assets 0.5 3.7 0.5 3.7
Gross purchases, sales, issuances and settlements        
Purchases, assets 0.5 3.7 0.5 3.7
Net purchases, sales, issuances and settlements, assets 0.5 3.7 0.5 3.7
Non-U.S. governments | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 4.2 7.0 4.6 7.4
Total realized/unrealized gains (losses) included in other comprehensive income, assets       (0.1)
Net purchases, sales, issuances and settlements, assets (0.3) (0.4) (0.7) (0.7)
Ending balance, assets 3.9 6.6 3.9 6.6
Gross purchases, sales, issuances and settlements        
Settlements, assets (0.3) (0.4) (0.7) (0.7)
Net purchases, sales, issuances and settlements, assets (0.3) (0.4) (0.7) (0.7)
Corporate debt securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 58.5 103.8 57.9 128.0
Total realized/unrealized gains (losses) included in net income, assets       1.1
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (0.7) 0.4 (0.3)
Net purchases, sales, issuances and settlements, assets (13.8) (6.0) (13.6) (3.6)
Transfers into Level 3, assets   0.4   1.0
Transfers out of Level 3, assets   (11.5)   (40.2)
Ending balance, assets 44.7 86.0 44.7 86.0
Gross purchases, sales, issuances and settlements        
Purchases, assets 5.2 0.7 5.7 12.0
Sales, assets (0.2)   (0.4) (4.2)
Settlements, assets (18.8) (6.7) (18.9) (11.4)
Net purchases, sales, issuances and settlements, assets (13.8) (6.0) (13.6) (3.6)
Commercial mortgage-backed securities | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 12.0 11.1 9.5 10.6
Total realized/unrealized gains (losses) included in net income, assets (3.2)   (3.2) (2.5)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 2.9 (0.1) 3.2 0.5
Net purchases, sales, issuances and settlements, assets     2.2 (0.1)
Transfers into Level 3, assets 3.7   3.7 2.5
Transfers out of Level 3, assets (2.3) (0.9) (2.3) (0.9)
Ending balance, assets 13.1 10.1 13.1 10.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (2.1)   (2.1)  
Gross purchases, sales, issuances and settlements        
Purchases, assets     2.4  
Settlements, assets     (0.2) (0.1)
Net purchases, sales, issuances and settlements, assets     2.2 (0.1)
Collateralized debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 5.9 80.7 8.3 125.0
Total realized/unrealized gains (losses) included in net income, assets     (2.5) (0.6)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.5 (0.4) 0.3 0.6
Net purchases, sales, issuances and settlements, assets (1.6) 27.8 (1.3) 2.3
Transfers into Level 3, assets 30.0 12.0 30.0 12.1
Transfers out of Level 3, assets   (39.9)   (59.2)
Ending balance, assets 34.8 80.2 34.8 80.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets     (2.5) (0.6)
Gross purchases, sales, issuances and settlements        
Purchases, assets   28.1   28.1
Settlements, assets (1.6) (0.3) (1.3) (25.8)
Net purchases, sales, issuances and settlements, assets (1.6) 27.8 (1.3) 2.3
Other debt obligations | Available-for-sale        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 43.4 2.1 58.5 2.3
Total realized/unrealized gains (losses) included in net income, assets   (0.1)    
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.5 0.3 1.6 0.2
Net purchases, sales, issuances and settlements, assets 16.0 92.5 25.8 92.3
Transfers out of Level 3, assets     (26.0)  
Ending balance, assets 59.9 94.8 59.9 94.8
Gross purchases, sales, issuances and settlements        
Purchases, assets 16.8 94.4 26.8 94.4
Settlements, assets (0.8) (1.9) (1.0) (2.1)
Net purchases, sales, issuances and settlements, assets 16.0 92.5 25.8 92.3
Equity securities        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 0.4 14.9   2.7
Total realized/unrealized gains (losses) included in net income, assets   0.7   12.9
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.4)      
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)
Other investments        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 29.4 9.3 17.2 6.5
Total realized/unrealized gains (losses) included in net income, assets 0.1 0.3 2.3 1.8
Net purchases, sales, issuances and settlements, assets (0.4) 3.6 (0.4) 4.9
Transfers into Level 3, assets     10.0  
Ending balance, assets 29.1 13.2 29.1 13.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 0.1 0.3 2.3 1.8
Gross purchases, sales, issuances and settlements        
Purchases, assets 4.5 3.6 4.5 4.9
Sales, assets (4.9)   (4.9)  
Net purchases, sales, issuances and settlements, assets (0.4) 3.6 (0.4) 4.9
Separate account assets        
Changes in Level 3 fair value measurements rollforward, assets and liabilities        
Beginning balance, assets 8,718.7 7,991.9 8,615.5 7,651.4
Total realized/unrealized gains (losses) included in net income, assets 138.9 245.4 313.5 409.8
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.5 0.1 0.1 (0.6)
Net purchases, sales, issuances and settlements, assets 4.2 54.5 (66.1) 231.3
Transfers out of Level 3, assets (172.5) (0.4) (173.2) (0.4)
Ending balance, assets 8,689.8 8,291.5 8,689.8 8,291.5
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 126.4 257.9 327.2 402.6
Gross purchases, sales, issuances and settlements        
Purchases, assets 41.0 231.4 120.0 571.8
Sales, assets (112.8) (124.1) (214.5) (228.5)
Issuances, assets (156.5) (60.0) (203.8) (105.5)
Settlements, assets 232.5 7.2 232.2 (6.5)
Net purchases, sales, issuances and settlements, assets $ 4.2 $ 54.5 $ (66.1) $ 231.3