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Reconciliations of Changes in Level Three Assets Measured at Fair Value (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance   $ 1,825.6 $ 1,609.3
Net realized/unrealized gains (losses) included in:      
Net earnings [1]   (12.9) 2.3
Other comprehensive income (loss)   59.8 (29.3)
Purchases   220.9 899.9
Sales   (384.4) (62.4)
Settlements   (115.0) (372.9)
Transfers into Level 3 $ 5.8 21.8 64.3
Transfers out of Level 3 (1.5) (16.4) (210.6)
Ending balance 1,599.4 1,599.4 1,900.6
Preferred Stock      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance   5.4 1.9
Net realized/unrealized gains (losses) included in:      
Net earnings [1]   (1.6)  
Other comprehensive income (loss)     0.2
Purchases   0.3 2.0
Sales     (0.1)
Transfers into Level 3     4.4
Ending balance 4.1 4.1 8.4
U.S. corporate bonds      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance   425.7 260.0
Net realized/unrealized gains (losses) included in:      
Net earnings [1]   (9.9)  
Other comprehensive income (loss)   40.0 (7.4)
Purchases   123.2 153.7
Settlements   (6.3) (3.2)
Transfers into Level 3   1.3 1.2
Transfers out of Level 3   (2.7) (1.3)
Ending balance 571.3 571.3 403.0
Foreign corporate bonds      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance   126.9 75.2
Net realized/unrealized gains (losses) included in:      
Net earnings [1]   (0.2) (0.1)
Other comprehensive income (loss)   3.5 (2.5)
Purchases   27.3 38.9
Sales   (5.6)  
Settlements   (8.9) (2.9)
Transfers into Level 3   14.7  
Transfers out of Level 3   (1.6) (0.2)
Ending balance 156.1 156.1 108.4
RMBS      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance     161.8
Net realized/unrealized gains (losses) included in:      
Net earnings [1]     (0.3)
Other comprehensive income (loss)     (5.3)
Purchases   1.7  
Settlements     (5.6)
Transfers out of Level 3     (150.6)
Ending balance 1.7 1.7  
Other Asset Backed Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance   1,266.9 1,101.3
Net realized/unrealized gains (losses) included in:      
Net earnings [1]   (1.1) 1.5
Other comprehensive income (loss)   16.7 (10.3)
Purchases   68.3 705.3
Sales   (378.8) (56.7)
Settlements   (99.8) (361.2)
Transfers into Level 3   5.8  
Transfers out of Level 3   (12.1)  
Ending balance 865.9 865.9 1,379.9
Other invested assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance [2]   0.7 7.5
Net realized/unrealized gains (losses) included in:      
Net earnings [1],[2]   (0.1) 1.2
Other comprehensive income (loss) [2]   (0.4) (4.0)
Purchases [2]   0.1  
Sales [2]     (5.6)
Transfers into Level 3 [2]     58.7
Transfers out of Level 3 [2]     (56.9)
Ending balance [2] $ 0.3 $ 0.3 0.9
CMBS      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance     1.6
Net realized/unrealized gains (losses) included in:      
Transfers out of Level 3     $ (1.6)
[1] There were no other than temporary impairment (“OTTI”) losses recorded in net earnings related to Level 3 assets still held as of September 30, 2019 and 2018.
[2] Includes partnership and non-marketable equity investments accounted for at fair value.