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Consolidated Statements Of Shareholders' Equity (USD $)
In Millions
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Net Unrealized Appreciation On Investments And Derivative Instruments [Member]
Defined Benefit Pension And Postretirement Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative Foreign Currency Translation Adjustment [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Beginning balance at Dec. 31, 2009 $ 0.6$ 1,808.5$ 107.7$ (78.9)  $ 1,141.1$ (620.4) 
Shares purchased at cost        (126.0) 
Employee and director stock-based awards and other  (9.9)       
Amount recognized as net periodic benefit cost during the period    7.3    7.3
Provision for deferred income taxes    (2.6)    (2.6)
Total pension and postretirement benefits    4.7    4.7
Net shares reissued at cost under employee stock-based compensation plans        21.5 
Net income (loss)       96.4 96.4
Net appreciation during the period:          
Net appreciation on available-for-sale securities and derivative instruments   227.1      
Benefit (provision) for deferred income taxes   (57.4)      
Total available-for-sale securities   169.7      
Dividends to shareholders       (35.9)  
Treasury stock issued for less than cost       (7.9)  
Recognition of employee stock-based compensation       7.6  
Ending balance at Sep. 30, 201000.61,798.6277.4(74.2)203.2 1,201.3(724.9)2,478.8
Beginning balance at Dec. 31, 2010 0.61,796.5218.3(81.6)  1,246.8(720.1)2,460.5
Shares purchased at cost        (20.0) 
Employee and director stock-based awards and other  (11.3)       
Amount recognized as net periodic benefit cost during the period    7.7    7.7
Provision for deferred income taxes    (2.7)    (2.7)
Total pension and postretirement benefits    5.0    5.0
Amount recognized as cumulative foreign currency translation during the period      (14.5)  (14.5)
Benefit (provision) for deferred income taxes      5.1  5.1
Total cumulative foreign currency translation adjustment      (9.4)  (9.4)
Net shares reissued at cost under employee stock-based compensation plans        17.0 
Net income (loss)       (12.2) (12.2)
Net appreciation during the period:          
Net appreciation on available-for-sale securities and derivative instruments   48.1      
Benefit (provision) for deferred income taxes   11.1      
Total available-for-sale securities   59.2      
Dividends to shareholders       (37.5)  
Treasury stock issued for less than cost       (6.1)  
Recognition of employee stock-based compensation       9.7  
Ending balance at Sep. 30, 2011$ 0$ 0.6$ 1,785.2$ 277.5$ (76.6)$ 191.5$ (9.4)$ 1,200.7$ (723.1)$ 2,454.9