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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 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]     0.5 (13.2)
Other comprehensive income (loss)     (5.0) (7.1)
Purchases     741.9 74.3
Sales     (0.5) (55.5)
Issuances     0.0 0.0
Settlements     (235.4) (55.9)
Transfers into Level 3 $ 0.0   5.8 0.0
Transfers out of Level 3 (24.5) $ (3.1) (35.4) (17.8)
Ending balance 2,205.6 1,565.2 2,205.6 1,565.2
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 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 (3.8)
Other comprehensive income (loss)     (11.4) 14.6
Purchases     46.4 14.0
Sales     0.0 0.0
Issuances     0.0 0.0
Settlements     (44.6) (9.3)
Transfers into Level 3     0.0 0.0
Transfers out of Level 3     (0.6) 0.0
Ending balance 621.6 620.5 621.6 620.5
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]     (0.1) 0.1
Other comprehensive income (loss)     (3.0) 3.2
Purchases     2.0 12.7
Sales     0.0 (0.8)
Issuances     0.0 0.0
Settlements     (2.4) (9.2)
Transfers into Level 3     0.0 0.0
Transfers out of Level 3     0.0 (3.3)
Ending balance 186.0 171.4 186.0 171.4
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 1.0
Sales     0.0 0.0
Issuances     0.0 0.0
Settlements     (0.3) (0.2)
Transfers into Level 3     0.0 0.0
Transfers out of Level 3     0.0 0.0
Ending balance 2.2 2.5 2.2 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 (0.3)
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 5.5 0.0 5.5
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]     0.0 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 0.0 0.3
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]     0.3 (9.5)
Other comprehensive income (loss)     9.4 (24.4)
Purchases     693.5 46.6
Sales     (0.1) (54.7)
Issuances     0.0 0.0
Settlements     (188.1) (37.2)
Transfers into Level 3     5.8 0.0
Transfers out of Level 3     (29.0) (14.5)
Ending balance $ 1,394.5 $ 763.0 $ 1,394.5 $ 763.0
[1] There were no credit losses recorded in net earnings related to Level 3 instruments still held as of June 30, 2021 and 2020.
[2] Includes partnership and non-marketable equity investments accounted for at fair value.