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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, 2022
Mar. 31, 2021
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, net derivative assets (liabilities)   $ (5.1)
Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) $ (1.4) (5.6)
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 0.7  
Ending balance, net derivative assets (liabilities) (0.7) (10.7)
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) (1.3) (4.9)
Gross purchases, sales, issuances and settlements    
Sales, net derivative assets (liabilities) 0.7  
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) 0.7  
Investment and universal life contracts    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, liabilities (356.3) (467.8)
Total realized/unrealized gains (losses) included in net income, liabilities 194.3 283.4
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities 0.2 0.1
Net purchases, sales, issuances and settlements, liabilities 8.0 7.2
Ending balance, liabilities (153.8) (177.1)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities 191.5 279.9
Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities 0.2 0.1
Gross purchases, sales, issuances and settlements    
Issuances, liabilities (5.5) (4.7)
Settlements, liabilities 13.5 11.9
Net purchases, sales, issuances and settlements, liabilities 8.0 7.2
Fixed maturities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 1,076.2 360.4
Total realized/unrealized gains (losses) included in net income, assets (3.0) (1.3)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (6.4) (9.7)
Net purchases, sales, issuances and settlements, assets 193.6 234.6
Transfers into Level 3, assets 175.2 130.6
Transfers out of Level 3, assets (104.0)  
Ending balance, assets 1,331.6 714.6
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.0) (1.2)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (6.6) (9.8)
Gross purchases, sales, issuances and settlements    
Purchases, assets 246.4 293.3
Sales, assets (20.4) (10.9)
Settlements, assets (32.4) (47.8)
Net purchases, sales, issuances and settlements, assets 193.6 234.6
Fixed maturities | Trading    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 4.9  
Net purchases, sales, issuances and settlements, assets 28.5  
Transfers into Level 3, assets 29.0  
Ending balance, assets 62.4  
Gross purchases, sales, issuances and settlements    
Purchases, assets 28.5  
Net purchases, sales, issuances and settlements, assets 28.5  
States and political subdivisions | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 94.8  
Total realized/unrealized gains (losses) included in other comprehensive income, assets 0.1  
Net purchases, sales, issuances and settlements, assets (0.4)  
Ending balance, assets 94.5  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 0.1  
Gross purchases, sales, issuances and settlements    
Settlements, assets (0.4)  
Net purchases, sales, issuances and settlements, assets (0.4)  
Corporate debt securities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 834.3 290.8
Total realized/unrealized gains (losses) included in net income, assets (3.0)  
Total realized/unrealized gains (losses) included in other comprehensive income, assets (4.7) (10.1)
Net purchases, sales, issuances and settlements, assets 139.0 0.4
Transfers into Level 3, assets 175.2 62.2
Ending balance, assets 1,140.8 343.3
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (3.0)  
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (4.7) (10.2)
Gross purchases, sales, issuances and settlements    
Purchases, assets 190.9 44.8
Sales, assets (20.4) (10.9)
Settlements, assets (31.5) (33.5)
Net purchases, sales, issuances and settlements, assets 139.0 0.4
Commercial mortgage-backed securities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 19.2 13.2
Total realized/unrealized gains (losses) included in net income, assets   (0.8)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.9) (0.7)
Net purchases, sales, issuances and settlements, assets (0.2) (0.2)
Ending balance, assets 18.1 11.5
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 (1.0) (0.7)
Gross purchases, sales, issuances and settlements    
Settlements, assets (0.2) (0.2)
Net purchases, sales, issuances and settlements, assets (0.2) (0.2)
Collateralized debt obligations | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 85.8 27.2
Total realized/unrealized gains (losses) included in net income, assets   (0.5)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.3) 0.1
Net purchases, sales, issuances and settlements, assets 55.5 248.7
Transfers into Level 3, assets   47.8
Transfers out of Level 3, assets (84.0)  
Ending balance, assets 57.0 323.3
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 (0.4) 0.1
Gross purchases, sales, issuances and settlements    
Purchases, assets 55.5 248.5
Settlements, assets   0.2
Net purchases, sales, issuances and settlements, assets 55.5 248.7
Other debt obligations | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 42.1 29.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.6) 1.0
Net purchases, sales, issuances and settlements, assets (0.3) (14.3)
Transfers into Level 3, assets   20.6
Transfers out of Level 3, assets (20.0)  
Ending balance, assets 21.2 36.5
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (0.6) 1.0
Gross purchases, sales, issuances and settlements    
Settlements, assets (0.3) (14.3)
Net purchases, sales, issuances and settlements, assets (0.3) (14.3)
Other investments    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 2.1 31.9
Total realized/unrealized gains (losses) included in net income, assets   9.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets (0.7)  
Ending balance, assets 1.4 41.1
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   9.3
Separate account assets    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 945.3 8,893.2
Total realized/unrealized gains (losses) included in net income, assets 71.4 95.5
Net purchases, sales, issuances and settlements, assets (1.3) (7,792.5)
Ending balance, assets 1,015.4 1,196.2
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 68.3 96.5
Gross purchases, sales, issuances and settlements    
Purchases, assets   36.7
Sales, assets   (7,792.5)
Issuances, assets (1.1) (114.0)
Settlements, assets (0.2) 77.3
Net purchases, sales, issuances and settlements, assets $ (1.3) $ (7,792.5)