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Reconciliations of Changes in Level Three Assets Measured at Fair Value (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 1,019.7 $ 1,067.8
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 12.3 8.1
Other comprehensive income 12.0 27.7
Purchases 1,421.2 225.7
Sales (192.7) (113.6)
Issuances 0.0 0.0
Settlements (590.9) (186.4)
Transfers into Level 3 5.5 10.6
Transfers out of Level 3 (77.8) (20.2)
Ending balance 1,609.3 1,019.7
Equity Securities | Common Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 4.3  
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 0.1 (0.6)
Other comprehensive income   1.8
Purchases   2.2
Sales (2.6) (0.2)
Issuances 0.0 0.0
Transfers into Level 3 1.4 1.4
Transfers out of Level 3 (3.2) (0.3)
Ending balance   4.3
Equity Securities | Preferred Stock    
Net realized/unrealized gains (losses) included in:    
Net earnings [1] (0.2)  
Other comprehensive income 0.2  
Purchases 5.6  
Sales (0.6)  
Issuances 0.0  
Transfers out of Level 3 (3.1)  
Ending balance 1.9  
Debt Securities | Foreign government obligations    
Net realized/unrealized gains (losses) included in:    
Purchases 4.8  
Issuances 0.0  
Transfers out of Level 3 (4.8)  
Debt Securities | U.S. corporate bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 72.9 49.8
Net realized/unrealized gains (losses) included in:    
Net earnings [1] (0.6) (0.3)
Other comprehensive income 2.6 0.1
Purchases 252.3 46.1
Sales (41.2) (15.0)
Issuances 0.0 0.0
Settlements (8.5) (6.5)
Transfers into Level 3 3.8 7.3
Transfers out of Level 3 (21.3) (8.6)
Ending balance 260.0 72.9
Debt Securities | Foreign corporate bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 0.4  
Net realized/unrealized gains (losses) included in:    
Net earnings [1] (1.5)  
Other comprehensive income 0.4  
Purchases 79.3 0.4
Sales (0.6) (0.2)
Issuances 0.0 0.0
Settlements (0.9)  
Transfers into Level 3 0.3 1.9
Transfers out of Level 3 (2.2) (1.7)
Ending balance 75.2 0.4
Debt Securities | Mortgage and asset backed securities | RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 5.9 14.9
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 0.3 0.3
Other comprehensive income 1.2 (0.5)
Purchases 161.1  
Sales   (7.0)
Issuances 0.0 0.0
Settlements (1.4) (1.8)
Transfers out of Level 3 (5.3)  
Ending balance 161.8 5.9
Debt Securities | Mortgage and asset backed securities | CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 4.3 20.2
Net realized/unrealized gains (losses) included in:    
Net earnings [1]   (0.2)
Other comprehensive income 0.1 0.4
Purchases 11.2  
Sales (11.8) (9.7)
Issuances 0.0 0.0
Settlements (0.5) (0.6)
Transfers out of Level 3 (1.7) (5.8)
Ending balance 1.6 4.3
Debt Securities | Mortgage and asset backed securities | Other asset-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 903.8 953.0
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 4.0 4.2
Other comprehensive income 16.8 27.4
Purchases 906.9 177.0
Sales (114.4) (76.8)
Issuances 0.0 0.0
Settlements (579.6) (177.5)
Transfers out of Level 3 (36.2) (3.5)
Ending balance 1,101.3 903.8
Other invested assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance [2] 28.1 29.9
Net realized/unrealized gains (losses) included in:    
Net earnings [1],[2] 10.2 4.7
Other comprehensive income [2] (9.3) (1.5)
Sales [2] (21.5) (4.7)
Issuances [2] 0.0 0.0
Transfers out of Level 3 [2]   (0.3)
Ending balance [2] $ 7.5 $ 28.1
[1] There were no OTTI losses recorded in net earnings related to Level 3 instruments still held as of December 31, 2017 and 2016.
[2] Includes partnership and non-marketable equity investments accounted for on an AFS basis.