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Reconciliations of Changes in Level Three Assets Measured at Fair Value (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 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] (15.3) 1.5
Other comprehensive income (loss) 63.4 (68.9)
Purchases 318.0 1,089.5
Sales (384.0) (70.8)
Settlements (163.7) (578.4)
Transfers into Level 3 21.8 65.0
Transfers out of Level 3 (25.4) (221.6)
Ending balance 1,640.4 1,825.6
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] (1.7)  
Other comprehensive income (loss)   (2.7)
Purchases 0.3 2.0
Sales   (0.1)
Transfers into Level 3   4.3
Transfers out of Level 3 (2.0)  
Ending balance 2.0 5.4
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] (6.5) (0.9)
Other comprehensive income (loss) 39.4 (11.5)
Purchases 184.8 182.3
Settlements (37.0) (4.8)
Transfers into Level 3 1.3 1.9
Transfers out of Level 3 (2.7) (1.3)
Ending balance 605.0 425.7
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] (5.9) (0.1)
Other comprehensive income (loss) 7.5 (2.9)
Purchases 42.7 58.9
Sales (5.6)  
Settlements (10.0) (4.0)
Transfers into Level 3 14.7  
Transfers out of Level 3 (1.6) (0.2)
Ending balance 168.7 126.9
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) 0.1 (5.3)
Purchases 1.8  
Settlements   (5.6)
Transfers out of Level 3   (150.6)
Ending balance 1.9  
CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance   1.6
Net realized/unrealized gains (losses) included in:    
Purchases 6.0  
Transfers out of Level 3 (0.2) (1.6)
Ending balance 5.8  
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) 1.6
Other comprehensive income (loss) 16.7 (42.3)
Purchases 82.3 846.3
Sales (378.3) (65.0)
Settlements (116.7) (564.0)
Transfers into Level 3 5.8  
Transfers out of Level 3 (18.9) (11.0)
Ending balance 856.7 1,266.9
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] (0.3) (4.2)
Purchases [2] 0.1  
Sales [2] (0.1) (5.7)
Transfers into Level 3 [2]   58.8
Transfers out of Level 3 [2]   (56.9)
Ending balance [2] $ 0.3 $ 0.7
[1] There were no OTTI losses recorded in net earnings related to Level 3 instruments still held as of December 31, 2019 and 2018.
[2] Includes partnership and non-marketable equity investments accounted for at fair value.