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Reconciliation of Changes in Level 3 Assets Measured at Fair Value (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 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 (losses) [1] 0.4 0.1
Other comprehensive income (loss) (14.4) (128.8)
Purchases 213.8 58.9
Sales (0.4) (8.3)
Issuances 0.0 0.0
Settlements (113.1) (37.2)
Transfers into Level 3 5.8 0.0
Transfers out of Level 3 (10.9) (14.7)
Ending balance 1,814.9 1,510.4
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 (losses) [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 2.0
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 (losses) [1] 0.2 0.2
Other comprehensive income (loss) (17.1) (18.8)
Purchases 19.6 6.7
Sales 0.0 0.0
Issuances 0.0 0.0
Settlements (23.6) (3.6)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Ending balance 610.7 589.5
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 (losses) [1] 0.0 0.0
Other comprehensive income (loss) (3.9) (7.3)
Purchases 2.0 7.7
Sales 0.0 0.0
Issuances 0.0 0.0
Settlements (1.2) (1.1)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 (3.3)
Ending balance 186.4 164.7
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 (losses) [1] 0.0 0.0
Other comprehensive income (loss) 0.0 (0.2)
Purchases 0.0 0.9
Sales 0.0 0.0
Issuances 0.0 0.0
Settlements (0.2) (0.1)
Transfers into Level 3 0.0 0.0
Transfers out of Level 3 0.0 0.0
Ending balance 2.3 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 (losses) [1] 0.0 0.0
Other comprehensive income (loss) 0.0 (1.3)
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 (5.8) 0.0
Ending balance 0.0 4.5
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 (losses) [1],[2] 0.1 0.0
Other comprehensive income (loss) [2] (0.1) 0.2
Purchases [2] 0.0 0.0
Sales [2] (0.3) 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 0.5
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 (losses) [1] 0.1 (0.1)
Other comprehensive income (loss) 6.7 (101.4)
Purchases 192.2 43.6
Sales (0.1) (8.3)
Issuances 0.0 0.0
Settlements (88.1) (32.4)
Transfers into Level 3 5.8 0.0
Transfers out of Level 3 (5.1) (11.4)
Ending balance $ 1,014.2 $ 746.7
[1] There were no credit losses recorded in net earnings related to Level 3 instruments still held as of March 31, 2021 and 2020.
[2] Includes partnership and non-marketable equity investments accounted for at fair value.