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Reconciliation of Changes in Level 3 Assets Measured at Fair Value (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 1,733.7 $ 1,640.4
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 0.7 (13.8)
Other comprehensive income (loss) (19.4) 35.5
Purchases 951.9 285.7
Sales (13.0) (64.5)
Issuances 0.0 0.0
Settlements (412.5) (128.9)
Transfers into Level 3 5.8 0.0
Transfers out of Level 3 (48.2) (20.7)
Ending balance 2,199.0 1,733.7
Preferred Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 1.3 2.0
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 0.0 (0.7)
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
Foreign government obligations    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 0.0 0.0
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 0.0 0.0
Other comprehensive income (loss) 0.0 0.0
Purchases 1.7 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 (1.7) 0.0
Ending balance 0.0 0.0
U.S. corporate bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 631.6 605.0
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 0.1 (3.8)
Other comprehensive income (loss) (20.4) 22.7
Purchases 151.2 56.4
Sales (0.2) (2.0)
Issuances 0.0 0.0
Settlements (88.3) (46.7)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 (3.7) 0.0
Ending balance 670.3 631.6
Foreign corporate bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 189.5 168.7
Net realized/unrealized gains (losses) included in:    
Net earnings [1] (0.1) 0.1
Other comprehensive income (loss) (7.2) 7.3
Purchases 22.7 32.0
Sales 0.0 (0.8)
Issuances 0.0 0.0
Settlements (27.7) (11.6)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 (6.2)
Ending balance 177.2 189.5
RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 2.5 1.9
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 0.1 0.0
Other comprehensive income (loss) (0.1) 0.1
Purchases 0.0 0.9
Sales 0.0 0.0
Issuances 0.0 0.0
Settlements (0.6) (0.4)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Ending balance 1.9 2.5
CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 5.8 5.8
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 0.0 0.0
Other comprehensive income (loss) 0.0 0.1
Purchases 0.0 0.0
Sales 0.0 0.0
Issuances 0.0 0.0
Settlements 0.0 (0.1)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 (5.8) 0.0
Ending balance 0.0 5.8
Other asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 902.7 856.7
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 0.5 (9.4)
Other comprehensive income (loss) 8.3 5.3
Purchases 776.3 196.4
Sales (12.4) (61.7)
Issuances 0.0 0.0
Settlements (295.9) (70.1)
Transfers into Level 3 5.8 0.0
Transfers out of Level 3 (37.0) (14.5)
Ending balance 1,348.3 902.7
Other invested assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance [2] 0.3 0.3
Net realized/unrealized gains (losses) included in:    
Net earnings [1],[2] 0.1 0.0
Other comprehensive income (loss) [2] 0.0 0.0
Purchases [2] 0.0 0.0
Sales [2] (0.4) 0.0
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 $ 0.3
[1] There were no credit losses recorded in net earnings related to Level 3 instruments still held as of December 31, 2021 and 2020.
[2] Includes partnership and non-marketable equity investments accounted for at fair value.