Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions |
12 Months Ended |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
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Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
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Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
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Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
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Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
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Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
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Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
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Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
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Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
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Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
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Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
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Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
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Beginning balance, net derivative assets (liabilities) |
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$ (5.1)
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$ 13.0
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Total realized/unrealized gains (losses) included in net income, net derivative assets (liabilities) |
$ (5.4)
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$ (6.9)
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$ 11.8
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Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |
Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
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Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
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Gain (Loss) on Investments, Change In Fair Value Of Funds Withheld Embedded Derivative
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Total realized/unrealized gains (losses) included in other comprehensive income, net derivative assets (liabilities) |
$ (0.3)
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Fair Value, Net Derivative Asset (Liability), Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] |
Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
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Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
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Other Comprehensive Income Available for Sale Securities Period Increase Decrease Net of Tax, Other Comprehensive Income Derivatives Period Increase (Decrease), Net of Tax
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Net purchases, sales, issuances and settlements, net derivative assets (liabilities) |
$ 2.6
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$ 12.0
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$ (3.4)
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Transfers out of Level 3, net derivative assets (liabilities) |
(0.3)
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(26.5)
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Ending balance, net derivative assets (liabilities) |
(3.4)
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(5.1)
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Changes in unrealized gains (losses) included in net income relating to positions still held, net derivative assets (liabilities) |
(3.4)
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(0.6)
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9.9
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Changes in unrealized gains (losses) included in OCI relating to positions still held, derivative assets |
(0.2)
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Gross purchases, sales, issuances and settlements |
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Sales, net derivative assets (liabilities) |
2.6
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12.0
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(3.4)
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Net purchases, sales, issuances and settlements, net derivative assets (liabilities) |
2.6
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12.0
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(3.4)
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Investment and universal life contracts |
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Beginning balance, liabilities |
(356.3)
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(467.8)
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(214.2)
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Total realized/unrealized gains (losses) included in net income, liabilities |
369.0
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81.7
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(254.9)
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Total realized/unrealized gains (losses) included in other comprehensive income, liabilities |
0.1
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0.2
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(0.3)
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Net purchases, sales, issuances and settlements, liabilities |
19.0
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29.6
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1.6
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Ending balance, liabilities |
31.8
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(356.3)
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(467.8)
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Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities |
354.7
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80.3
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(262.1)
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Changes in unrealized gains (losses) included in OCI relating to positions still held, liabilities |
0.1
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0.2
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(0.3)
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Gross purchases, sales, issuances and settlements |
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Issuances, liabilities |
(7.4)
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(16.4)
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(23.0)
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Settlements, liabilities |
26.4
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46.0
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24.6
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Net purchases, sales, issuances and settlements, liabilities |
19.0
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29.6
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1.6
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Funds withheld payable embedded derivative |
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Total realized/unrealized gains (losses) included in net income, assets |
3,652.8
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Ending balance, assets |
3,652.8
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Changes in unrealized gains (losses) included in net income relating to positions still held, liabilities |
3,652.8
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Fixed maturities | Available-for-sale |
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Beginning balance, assets |
1,076.2
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360.4
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384.9
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Total realized/unrealized gains (losses) included in net income, assets |
(5.1)
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(24.9)
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(4.5)
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Total realized/unrealized gains (losses) included in other comprehensive income, assets |
(75.1)
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22.2
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(16.7)
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Net purchases, sales, issuances and settlements, assets |
1,246.1
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826.4
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263.0
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Transfers into Level 3, assets |
188.3
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352.9
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388.4
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Transfers out of Level 3, assets |
(263.8)
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(460.8)
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(654.7)
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Ending balance, assets |
2,166.6
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1,076.2
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360.4
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Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
(1.3)
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(7.6)
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(3.4)
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Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
(61.1)
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13.6
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13.1
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Gross purchases, sales, issuances and settlements |
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Purchases, assets |
1,456.6
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1,125.4
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366.0
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Sales, assets |
(62.7)
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(84.3)
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(5.5)
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Settlements, assets |
(147.8)
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(214.7)
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(97.5)
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Net purchases, sales, issuances and settlements, assets |
1,246.1
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826.4
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263.0
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Fixed maturities | Trading |
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Beginning balance, assets |
4.9
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0.3
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Total realized/unrealized gains (losses) included in net income, assets |
(0.6)
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Net purchases, sales, issuances and settlements, assets |
100.7
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4.9
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Transfers into Level 3, assets |
29.0
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Transfers out of Level 3, assets |
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(0.3)
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Ending balance, assets |
134.0
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4.9
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Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
(0.6)
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Gross purchases, sales, issuances and settlements |
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Purchases, assets |
134.7
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4.9
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Sales, assets |
(32.6)
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Settlements, assets |
(1.4)
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Net purchases, sales, issuances and settlements, assets |
100.7
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4.9
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States and political subdivisions | Available-for-sale |
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Beginning balance, assets |
94.8
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Total realized/unrealized gains (losses) included in other comprehensive income, assets |
(24.1)
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12.8
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Net purchases, sales, issuances and settlements, assets |
(1.6)
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(0.4)
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Transfers into Level 3, assets |
12.0
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82.4
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Transfers out of Level 3, assets |
(10.2)
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Ending balance, assets |
70.9
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94.8
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Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
(22.3)
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12.8
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Gross purchases, sales, issuances and settlements |
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Settlements, assets |
(1.6)
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(0.4)
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Net purchases, sales, issuances and settlements, assets |
(1.6)
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(0.4)
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Corporate debt securities | Available-for-sale |
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Beginning balance, assets |
834.3
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290.8
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81.7
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Total realized/unrealized gains (losses) included in net income, assets |
(4.8)
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(21.9)
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(0.9)
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Total realized/unrealized gains (losses) included in other comprehensive income, assets |
(28.6)
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7.8
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5.2
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Net purchases, sales, issuances and settlements, assets |
626.3
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381.8
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118.0
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Transfers into Level 3, assets |
176.3
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175.8
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342.0
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Transfers out of Level 3, assets |
(35.2)
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(255.2)
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Ending balance, assets |
1,568.3
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834.3
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290.8
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Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
(1.3)
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(4.6)
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Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
(19.8)
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(0.7)
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11.9
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Gross purchases, sales, issuances and settlements |
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Purchases, assets |
817.3
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626.6
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169.2
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Sales, assets |
(50.4)
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(84.3)
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(5.5)
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Settlements, assets |
(140.6)
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(160.5)
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(45.7)
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Net purchases, sales, issuances and settlements, assets |
626.3
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381.8
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118.0
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Commercial mortgage-backed securities | Available-for-sale |
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Beginning balance, assets |
19.2
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13.2
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12.9
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Total realized/unrealized gains (losses) included in net income, assets |
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(1.0)
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(1.3)
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Total realized/unrealized gains (losses) included in other comprehensive income, assets |
(1.0)
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(0.4)
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1.4
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Net purchases, sales, issuances and settlements, assets |
(4.6)
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7.4
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(0.1)
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Transfers into Level 3, assets |
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|
0.3
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Transfers out of Level 3, assets |
(10.2)
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Ending balance, assets |
3.4
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19.2
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13.2
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Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
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(1.0)
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(1.2)
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Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
(0.5)
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(0.4)
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1.5
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Gross purchases, sales, issuances and settlements |
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Purchases, assets |
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7.7
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Sales, assets |
(4.1)
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|
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Settlements, assets |
(0.5)
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(0.3)
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(0.1)
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Net purchases, sales, issuances and settlements, assets |
(4.6)
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7.4
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(0.1)
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Collateralized debt obligations | Available-for-sale |
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Beginning balance, assets |
85.8
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27.2
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199.0
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Total realized/unrealized gains (losses) included in net income, assets |
|
(2.0)
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(2.3)
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Total realized/unrealized gains (losses) included in other comprehensive income, assets |
(1.0)
|
1.6
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(21.9)
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Net purchases, sales, issuances and settlements, assets |
151.8
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420.7
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183.0
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Transfers into Level 3, assets |
|
74.1
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Transfers out of Level 3, assets |
(180.4)
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(435.8)
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(330.6)
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Ending balance, assets |
56.2
|
85.8
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27.2
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Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
|
(2.0)
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(2.2)
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Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
|
1.9
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(0.3)
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Gross purchases, sales, issuances and settlements |
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Purchases, assets |
151.9
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446.0
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182.5
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Settlements, assets |
(0.1)
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(25.3)
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0.5
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Net purchases, sales, issuances and settlements, assets |
151.8
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420.7
|
183.0
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Other debt obligations | Available-for-sale |
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Beginning balance, assets |
42.1
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29.2
|
91.3
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Total realized/unrealized gains (losses) included in net income, assets |
(0.3)
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|
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Total realized/unrealized gains (losses) included in other comprehensive income, assets |
(20.4)
|
0.4
|
(1.4)
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Net purchases, sales, issuances and settlements, assets |
474.2
|
16.9
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(37.9)
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Transfers into Level 3, assets |
|
20.6
|
46.1
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Transfers out of Level 3, assets |
(27.8)
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(25.0)
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(68.9)
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Ending balance, assets |
467.8
|
42.1
|
29.2
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Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
(18.5)
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Gross purchases, sales, issuances and settlements |
|
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Purchases, assets |
487.4
|
45.1
|
14.3
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Sales, assets |
(8.2)
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|
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Settlements, assets |
(5.0)
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(28.2)
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(52.2)
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Net purchases, sales, issuances and settlements, assets |
474.2
|
16.9
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(37.9)
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Other investments |
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
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Beginning balance, assets |
2.1
|
31.9
|
39.0
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Total realized/unrealized gains (losses) included in net income, assets |
|
12.5
|
6.3
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Total realized/unrealized gains (losses) included in other comprehensive income, assets |
(0.6)
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(1.3)
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(2.9)
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Net purchases, sales, issuances and settlements, assets |
0.4
|
(41.0)
|
(10.5)
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Ending balance, assets |
1.9
|
2.1
|
31.9
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Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
|
12.5
|
5.3
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Changes in unrealized gains (losses) included in OCI relating to positions still held, assets |
|
(1.3)
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(2.9)
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Gross purchases, sales, issuances and settlements |
|
|
|
Purchases, assets |
0.4
|
|
0.5
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Sales, assets |
|
(41.0)
|
(11.0)
|
Net purchases, sales, issuances and settlements, assets |
0.4
|
(41.0)
|
(10.5)
|
Separate account assets |
|
|
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Changes in Level 3 fair value measurements rollforward, assets and liabilities |
|
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|
Beginning balance, assets |
945.3
|
8,893.2
|
8,968.0
|
Total realized/unrealized gains (losses) included in net income, assets |
113.5
|
313.1
|
463.7
|
Net purchases, sales, issuances and settlements, assets |
(23.9)
|
(8,261.0)
|
(538.5)
|
Ending balance, assets |
1,034.9
|
945.3
|
8,893.2
|
Changes in unrealized gains (losses) included in net income relating to positions still held, assets |
89.8
|
90.5
|
385.5
|
Gross purchases, sales, issuances and settlements |
|
|
|
Purchases, assets |
11.8
|
38.5
|
309.2
|
Sales, assets |
(4.5)
|
(8,206.2)
|
(658.2)
|
Issuances, assets |
(50.0)
|
(191.5)
|
(396.1)
|
Settlements, assets |
18.8
|
98.2
|
206.6
|
Net purchases, sales, issuances and settlements, assets |
$ (23.9)
|
$ (8,261.0)
|
$ (538.5)
|