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Reconciliations of Changes in Level Three Assets Measured at Fair Value (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 1,041.4 $ 708.5
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 3.3 20.2
Other comprehensive income (28.3) (25.7)
Purchases 270.6 793.8
Sales (186.9) (164.8)
Issuances 0.0 0.0
Settlements (29.3) (95.2)
Transfers into Level 3 19.9 58.4
Transfers out of Level 3 (22.9) (253.8)
Ending balance 1,067.8 1,041.4
Debt Securities    
Net realized/unrealized gains (losses) included in:    
Transfers into Level 3   58.4
Debt Securities | U.S. corporate bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 36.7 27.5
Net realized/unrealized gains (losses) included in:    
Net earnings [1] (0.6) (0.9)
Other comprehensive income (1.3)  
Purchases 35.5 22.5
Sales (1.9) (12.9)
Issuances 0.0 0.0
Settlements (16.9) (8.0)
Transfers into Level 3 14.2 23.2
Transfers out of Level 3 (15.9) (14.7)
Ending balance 49.8 36.7
Debt Securities | Foreign corporate bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 6.0 1.0
Net realized/unrealized gains (losses) included in:    
Other comprehensive income 0.8 (0.1)
Purchases   2.7
Sales (2.0) (1.2)
Issuances 0.0 0.0
Settlements   (1.5)
Transfers into Level 3 0.7 6.1
Transfers out of Level 3 (5.5) (1.0)
Ending balance   6.0
Debt Securities | Mortgage and asset backed securities | RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 18.2 78.8
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 0.6 20.8
Other comprehensive income (1.1) (13.3)
Sales   (58.2)
Issuances 0.0 0.0
Settlements (2.8) (9.9)
Ending balance 14.9 18.2
Debt Securities | Mortgage and asset backed securities | CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance 23.3 60.8
Net realized/unrealized gains (losses) included in:    
Net earnings [1] (0.4) (0.4)
Other comprehensive income (1.0) (1.2)
Purchases   14.4
Sales   (8.3)
Issuances 0.0 0.0
Settlements (1.7) (42.0)
Ending balance 20.2 23.3
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 933.1 258.4
Net realized/unrealized gains (losses) included in:    
Net earnings [1] 2.7 0.4
Other comprehensive income (25.9) (12.4)
Purchases 233.3 749.7
Sales (182.3) (79.3)
Issuances 0.0 0.0
Settlements (7.9) (12.8)
Transfers into Level 3   29.1
Ending balance 953.0 933.1
Other invested assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance [2] 24.1 282.0
Net realized/unrealized gains (losses) included in:    
Net earnings [1],[2] 1.0 0.3
Other comprehensive income [2] 0.2 1.3
Purchases [2] 1.8 4.5
Sales [2] (0.7) (4.9)
Issuances [2] 0.0 0.0
Settlements [2]   (21.0)
Transfers into Level 3 [2] 5.0  
Transfers out of Level 3 [2] (1.5) (238.1)
Ending balance [2] $ 29.9 $ 24.1
[1] There were no OTTI losses recorded in net earnings related to Level 3 instruments still held as of December 31, 2015 and 2014.
[2] Includes partnership and non-marketable equity investments accounted for on an AFS basis.