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Reconciliations of Changes in Level Three Assets Measured at Fair Value (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     $ 1,640.4 $ 1,825.6
Net realized/unrealized gains (losses) included in:        
Net earnings (losses) [1]     (13.2) (12.6)
Other comprehensive income (loss)     (7.1) 57.1
Purchases     74.3 162.2
Sales     (55.5) (305.8)
Settlements     (55.9) (82.8)
Transfers into Level 3   $ 1.3   16.0
Transfers out of Level 3 $ (3.1) (13.9) (17.8) (14.9)
Ending balance 1,565.2 1,644.8 1,565.2 1,644.8
Preferred Stock        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     2.0 5.4
Net realized/unrealized gains (losses) included in:        
Net earnings (losses) [1]       (1.6)
Purchases       0.3
Ending balance 2.0 4.1 2.0 4.1
U.S. corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     605.0 425.7
Net realized/unrealized gains (losses) included in:        
Net earnings (losses) [1]     (3.8) (10.0)
Other comprehensive income (loss)     14.6 31.3
Purchases     14.0 90.9
Settlements     (9.3) (3.6)
Transfers into Level 3       1.3
Transfers out of Level 3       (1.0)
Ending balance 620.5 534.6 620.5 534.6
Foreign corporate bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     168.7 126.9
Net realized/unrealized gains (losses) included in:        
Net earnings (losses) [1]     0.1 (0.1)
Other comprehensive income (loss)     3.2 5.4
Purchases     12.7 13.9
Sales     (0.8) (5.6)
Settlements     (9.2) (7.7)
Transfers into Level 3       14.7
Transfers out of Level 3     (3.3) (1.6)
Ending balance 171.4 145.9 171.4 145.9
RMBS        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     1.9  
Net realized/unrealized gains (losses) included in:        
Other comprehensive income (loss)     (0.2)  
Purchases     1.0  
Settlements     (0.2)  
Ending balance 2.5   2.5  
CMBS        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     5.8  
Net realized/unrealized gains (losses) included in:        
Other comprehensive income (loss)     (0.3)  
Purchases       0.2
Transfers out of Level 3       (0.2)
Ending balance 5.5   5.5  
Other invested assets        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance [2]     0.3 0.7
Net realized/unrealized gains (losses) included in:        
Net earnings (losses) [1],[2]       (0.2)
Other comprehensive income (loss) [2]       (0.1)
Purchases [2]       0.1
Ending balance [2] 0.3 0.5 0.3 0.5
Other Asset Backed Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     856.7 1,266.9
Net realized/unrealized gains (losses) included in:        
Net earnings (losses) [1]     (9.5) (0.7)
Other comprehensive income (loss)     (24.4) 20.5
Purchases     46.6 56.8
Sales     (54.7) (300.2)
Settlements     (37.2) (71.5)
Transfers out of Level 3     (14.5) (12.1)
Ending balance $ 763.0 $ 959.7 $ 763.0 $ 959.7
[1] There were no credit losses recorded in net earnings related to Level 3 assets still held as of June 30, 2020 and 2019.
[2] Includes partnership and non-marketable equity investments accounted for at fair value.