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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, 2020
Mar. 31, 2019
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, net derivative assets $ 13.0 $ 3.1
Total realized/unrealized gains (losses) included in net income, net derivative assets (0.7) (1.6)
Net purchases, sales, issuances and settlements, net derivative assets (1.4) 1.9
Transfers out of Level 3, net derivative assets (26.5)  
Ending balance, net derivative assets (15.6) 3.4
Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (1.4) (1.3)
Gross purchases, sales, issuances and settlements    
Sales, net derivative assets (liabilities) (1.4) 1.9
Net purchases, sales, issuances and settlements, net derivative assets (liabilities) (1.4) 1.9
Investment and universal life contracts    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, liabilities (214.2) (45.2)
Total realized/unrealized gains (losses) included in net income, liabilities (340.4) 4.3
Total realized/unrealized gains (losses) included in other comprehensive income, liabilities (0.3) 0.1
Net purchases, sales, issuances and settlements, liabilities (0.5) 0.3
Ending balance, liabilities (555.4) (40.5)
Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities (354.0) 5.6
Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities (0.3)  
Gross purchases, sales, issuances and settlements    
Issuances, liabilities (6.7) (1.3)
Settlements, liabilities 6.2 1.6
Net purchases, sales, issuances and settlements, liabilities (0.5) 0.3
Fixed maturities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 384.9 138.8
Total realized/unrealized gains (losses) included in net income, assets (0.1) (2.5)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (40.0) 1.6
Net purchases, sales, issuances and settlements, assets 181.4 12.1
Transfers into Level 3, assets 170.8  
Transfers out of Level 3, assets (236.1) (26.0)
Ending balance, assets 460.9 124.0
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (2.5)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (40.0)  
Gross purchases, sales, issuances and settlements    
Purchases, assets 183.6 12.9
Sales, assets (0.5) (0.2)
Settlements, assets (1.7) (0.6)
Net purchases, sales, issuances and settlements, assets 181.4 12.1
Fixed maturities | Trading    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 0.3  
Ending balance, assets 0.3  
Non-U.S. governments | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets   4.6
Net purchases, sales, issuances and settlements, assets   (0.4)
Ending balance, assets   4.2
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 81.7 57.9
Total realized/unrealized gains (losses) included in other comprehensive income, assets (16.3) 0.4
Net purchases, sales, issuances and settlements, assets 26.5 0.2
Transfers into Level 3, assets 124.7  
Transfers out of Level 3, assets (46.3)  
Ending balance, assets 170.3 58.5
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (16.3)  
Gross purchases, sales, issuances and settlements    
Purchases, assets 27.5 0.5
Sales, assets (0.5) (0.2)
Settlements, assets (0.5) (0.1)
Net purchases, sales, issuances and settlements, assets 26.5 0.2
Commercial mortgage-backed securities | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 12.9 9.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets 1.5 0.3
Net purchases, sales, issuances and settlements, assets   2.2
Ending balance, assets 14.4 12.0
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets 1.5  
Gross purchases, sales, issuances and settlements    
Purchases, assets   2.4
Settlements, assets   (0.2)
Net purchases, sales, issuances and settlements, assets   2.2
Collateralized debt obligations | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 199.0 8.3
Total realized/unrealized gains (losses) included in net income, assets (0.1) (2.5)
Total realized/unrealized gains (losses) included in other comprehensive income, assets (22.1) (0.2)
Net purchases, sales, issuances and settlements, assets 141.8 0.3
Transfers out of Level 3, assets (147.3)  
Ending balance, assets 171.3 5.9
Changes in unrealized gains (losses) included in net income relating to positions still held, assets   (2.5)
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (22.1)  
Gross purchases, sales, issuances and settlements    
Purchases, assets 141.8  
Settlements, assets   0.3
Net purchases, sales, issuances and settlements, assets 141.8 0.3
Other debt obligations | Available-for-sale    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 91.3 58.5
Total realized/unrealized gains (losses) included in other comprehensive income, assets (3.1) 1.1
Net purchases, sales, issuances and settlements, assets 13.1 9.8
Transfers into Level 3, assets 46.1  
Transfers out of Level 3, assets (42.5) (26.0)
Ending balance, assets 104.9 43.4
Changes in unrealized gains (losses) included in OCI relating to positions still held, assets (3.1)  
Gross purchases, sales, issuances and settlements    
Purchases, assets 14.3 10.0
Settlements, assets (1.2) (0.2)
Net purchases, sales, issuances and settlements, assets 13.1 9.8
Equity securities    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Total realized/unrealized gains (losses) included in other comprehensive income, assets   0.4
Ending balance, assets   0.4
Other investments    
Changes in Level 3 fair value measurements rollforward, assets and liabilities    
Beginning balance, assets 39.0 17.2
Total realized/unrealized gains (losses) included in net income, assets (0.1) 2.2
Total realized/unrealized gains (losses) included in other comprehensive income, assets (2.9)  
Transfers into Level 3, assets   10.0
Ending balance, assets 36.0 29.4
Changes in unrealized gains (losses) included in net income relating to positions still held, assets (0.1) 2.2
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 8,968.0 8,615.5
Total realized/unrealized gains (losses) included in net income, assets 144.6 174.6
Total realized/unrealized gains (losses) included in other comprehensive income, assets   (0.4)
Net purchases, sales, issuances and settlements, assets (245.9) (70.3)
Transfers out of Level 3, assets   (0.7)
Ending balance, assets 8,866.7 8,718.7
Changes in unrealized gains (losses) included in net income relating to positions still held, assets 126.4 180.7
Gross purchases, sales, issuances and settlements    
Purchases, assets 67.6 79.0
Sales, assets (184.1) (101.7)
Issuances, assets (174.2) (47.3)
Settlements, assets 44.8 (0.3)
Net purchases, sales, issuances and settlements, assets $ (245.9) $ (70.3)