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Reconciliation of Changes in Level 3 Assets Measured at Fair Value (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     $ 2,199.0 $ 1,733.7
Net realized/unrealized gains (losses) included in:        
Net earnings [1]     (0.5) 0.5
Other comprehensive income (loss)     (127.0) (5.0)
Purchases     161.8 741.9
Sales     (43.3) (0.5)
Issuances     0.0 0.0
Settlements     (81.0) (235.4)
Transfers into Level 3   $ 0.0 0.0 5.8
Transfers out of Level 3 $ (35.4) (24.5) (53.7) (35.4)
Ending balance 2,055.3 2,205.6 2,055.3 2,205.6
Preferred Stock        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     1.3 1.3
Net realized/unrealized gains (losses) included in:        
Net earnings [1]     0.0 0.0
Other comprehensive income (loss)     (0.0) 0.0
Purchases     0.0 0.0
Sales     0.0 0.0
Issuances     0.0 0.0
Settlements     0.0 0.0
Transfers into Level 3     0.0 0.0
Transfers out of Level 3     0.0 0.0
Ending balance 1.3 1.3 1.3 1.3
U.S. corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     670.3 631.6
Net realized/unrealized gains (losses) included in:        
Net earnings [1]     (0.2) 0.2
Other comprehensive income (loss)     (60.8) (11.4)
Purchases     59.7 46.4
Sales     (0.6) 0.0
Issuances     0.0 0.0
Settlements     (48.3) (44.6)
Transfers into Level 3     0.0 0.0
Transfers out of Level 3     (1.2) (0.6)
Ending balance 618.9 621.6 618.9 621.6
Foreign corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     177.2 189.5
Net realized/unrealized gains (losses) included in:        
Net earnings [1]     (0.2) (0.1)
Other comprehensive income (loss)     (17.2) (3.0)
Purchases     30.3 2.0
Sales     (0.3) 0.0
Issuances     0.0 0.0
Settlements     (2.2) (2.4)
Transfers into Level 3     0.0 0.0
Transfers out of Level 3     (3.1) 0.0
Ending balance 184.5 186.0 184.5 186.0
RMBS        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     1.9 2.5
Net realized/unrealized gains (losses) included in:        
Net earnings [1]     0.0 0.0
Other comprehensive income (loss)     (0.2) 0.0
Purchases     0.0 0.0
Sales     0.0 0.0
Issuances     0.0 0.0
Settlements     (0.2) (0.3)
Transfers into Level 3     0.0 0.0
Transfers out of Level 3     0.0 0.0
Ending balance 1.5 2.2 1.5 2.2
CMBS        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     0.0 5.8
Net realized/unrealized gains (losses) included in:        
Net earnings [1]     0.0 0.0
Other comprehensive income (loss)     0.0 0.0
Purchases     4.3 0.0
Sales     0.0 0.0
Issuances     0.0 0.0
Settlements     0.0 0.0
Transfers into Level 3     0.0 0.0
Transfers out of Level 3     (4.3) (5.8)
Ending balance 0.0 0.0 0.0 0.0
Other asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     1,348.3 902.7
Net realized/unrealized gains (losses) included in:        
Net earnings [1]     (0.1) 0.3
Other comprehensive income (loss)     (48.8) 9.4
Purchases     67.5 693.5
Sales     (42.4) (0.1)
Issuances     0.0 0.0
Settlements     (30.3) (188.1)
Transfers into Level 3     0.0 5.8
Transfers out of Level 3     (45.1) (29.0)
Ending balance 1,249.1 1,394.5 1,249.1 1,394.5
Other invested assets        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance [2]     0.0 0.3
Net realized/unrealized gains (losses) included in:        
Net earnings [1],[2]     0.0 0.1
Other comprehensive income (loss) [2]     0.0 0.0
Purchases [2]     0.0 0.0
Sales [2]     0.0 (0.4)
Issuances [2]     0.0 0.0
Settlements [2]     0.0 0.0
Transfers into Level 3 [2]     0.0 0.0
Transfers out of Level 3 [2]     0.0 0.0
Ending balance [2] $ 0.0 $ 0.0 $ 0.0 $ 0.0
[1] There were minimal or no credit losses recorded in net earnings related to Level 3 instruments still held as of June 30, 2022 and 2021.
[2] Includes partnership and non-marketable equity investments accounted for at fair value.