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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
Mar. 31, 2021
Mar. 31, 2020
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, net derivative assets (liabilities) $ (5.1) $ 13.0
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) (5.6) (0.7)
Net purchases, sales, issuances and settlements, net derivative assets (liabilities)   (1.4)
Transfers out of Level 3, net derivative assets (liabilities)   (26.5)
Ending balance, net derivative assets (liabilities) (10.7) (15.6)
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) (4.9) (1.4)
Gross purchases, sales, issuances and settlements    
Sales, net derivative assets (liabilities)   (1.4)
Net purchases, sales, issuances and settlements, net derivative assets (liabilities)   (1.4)
Investment and universal life contracts    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, liabilities (467.8) (214.2)
Total realized/unrealized gains (losses) included in net income, liabilities 283.4 (340.4)
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities 0.1 (0.3)
Net purchases, sales, issuances and settlements, liabilities 7.2 (0.5)
Ending balance, liabilities (177.1) (555.4)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 279.9 (354.0)
Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities 0.1 (0.3)
Gross purchases, sales, issuances and settlements    
Issuances, liabilities (4.7) (6.7)
Settlements, liabilities 11.9 6.2
Net purchases, sales, issuances and settlements, liabilities 7.2 (0.5)
Fixed maturities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 360.4 384.9
Total realized/unrealized gains (losses) included in net income, assets (1.3) (0.1)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (9.7) (40.0)
Net purchases, sales, issuances and settlements, assets 234.6 181.4
Transfers into Level 3, assets 130.6 170.8
Transfers out of Level 3, assets   (236.1)
Ending balance, assets 714.6 460.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (1.2)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (9.8) (40.0)
Gross purchases, sales, issuances and settlements    
Purchases, assets 293.3 183.6
Sales, assets (10.9) (0.5)
Settlements, assets (47.8) (1.7)
Net purchases, sales, issuances and settlements, assets 234.6 181.4
Fixed maturities | Trading    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets   0.3
Ending balance, assets   0.3
Corporate debt securities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 290.8 81.7
Total realized/unrealized gains (losses) included in other comprehensive income, assets (10.1) (16.3)
Net purchases, sales, issuances and settlements, assets 0.4 26.5
Transfers into Level 3, assets 62.2 124.7
Transfers out of Level 3, assets   (46.3)
Ending balance, assets 343.3 170.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.8)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (10.2) (16.3)
Gross purchases, sales, issuances and settlements    
Purchases, assets 44.8 27.5
Sales, assets (10.9) (0.5)
Settlements, assets (33.5) (0.5)
Net purchases, sales, issuances and settlements, assets 0.4 26.5
Commercial mortgage-backed securities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 13.2 12.9
Total realized/unrealized gains (losses) included in net income, assets (0.8)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.7) 1.5
Net purchases, sales, issuances and settlements, assets (0.2)  
Ending balance, assets 11.5 14.4
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.7) 1.5
Gross purchases, sales, issuances and settlements    
Settlements, assets (0.2)  
Net purchases, sales, issuances and settlements, assets (0.2)  
Collateralized debt obligations | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 27.2 199.0
Total realized/unrealized gains (losses) included in net income, assets (0.5) (0.1)
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.1 (22.1)
Net purchases, sales, issuances and settlements, assets 248.7 141.8
Transfers into Level 3, assets 47.8  
Transfers out of Level 3, assets   (147.3)
Ending balance, assets 323.3 171.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.4)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 0.1 (22.1)
Gross purchases, sales, issuances and settlements    
Purchases, assets 248.5 141.8
Settlements, assets 0.2  
Net purchases, sales, issuances and settlements, assets 248.7 141.8
Other debt obligations | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 29.2 91.3
Total realized/unrealized gains (losses) included in other comprehensive income, assets 1.0 (3.1)
Net purchases, sales, issuances and settlements, assets (14.3) 13.1
Transfers into Level 3, assets 20.6 46.1
Transfers out of Level 3, assets   (42.5)
Ending balance, assets 36.5 104.9
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 1.0 (3.1)
Gross purchases, sales, issuances and settlements    
Purchases, assets   14.3
Settlements, assets (14.3) (1.2)
Net purchases, sales, issuances and settlements, assets (14.3) 13.1
Other investments    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 31.9 39.0
Total realized/unrealized gains (losses) included in net income, assets 9.2 (0.1)
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (2.9)
Ending balance, assets 41.1 36.0
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 9.3 (0.1)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets   (2.9)
Separate account assets    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 8,893.2 8,968.0
Total realized/unrealized gains (losses) included in net income, assets 95.5 144.6
Net purchases, sales, issuances and settlements, assets (7,792.5) (245.9)
Ending balance, assets 1,196.2 8,866.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 96.5 126.4
Gross purchases, sales, issuances and settlements    
Purchases, assets 36.7 67.6
Sales, assets (7,792.5) (184.1)
Issuances, assets (114.0) (174.2)
Settlements, assets 77.3 44.8
Net purchases, sales, issuances and settlements, assets $ (7,792.5) $ (245.9)