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Reconciliation of Changes in Level 3 Assets Measured at Fair Value (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 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] 0.2 0.4
Other comprehensive income (loss) (57.7) (14.4)
Purchases 134.4 213.8
Sales (28.3) (0.4)
Issuances 0.0 0.0
Settlements (29.7) (113.1)
Transfers into Level 3 0.0 5.8
Transfers out of Level 3 (18.3) (10.9)
Ending balance 2,199.6 1,814.9
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
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) (35.5) (17.1)
Purchases 43.3 19.6
Sales 0.0 0.0
Issuances 0.0 0.0
Settlements (4.3) (23.6)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Ending balance 674.0 610.7
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] (0.0) 0.0
Other comprehensive income (loss) (10.0) (3.9)
Purchases 24.3 2.0
Sales 0.0 0.0
Issuances 0.0 0.0
Settlements (2.1) (1.2)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Ending balance 189.4 186.4
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) 0.0 0.0
Purchases 0.0 0.0
Sales 0.0 0.0
Issuances 0.0 0.0
Settlements (0.1) (0.2)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Ending balance 1.8 2.3
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 0.0 (5.8)
Ending balance 4.3 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] 0.0 0.1
Other comprehensive income (loss) (12.2) 6.7
Purchases 62.5 192.2
Sales (28.3) (0.1)
Issuances 0.0 0.0
Settlements (23.2) (88.1)
Transfers into Level 3 0.0 5.8
Transfers out of Level 3 (18.3) (5.1)
Ending balance 1,328.8 1,014.2
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 (0.1)
Purchases [2] 0.0 0.0
Sales [2] 0.0 (0.3)
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
[1] There were minimal or no credit losses recorded in net earnings related to Level 3 instruments still held as of March 31, 2022 and 2021.
[2] Includes partnership and non-marketable equity investments accounted for at fair value.