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Award Activity (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Weighted-Average Grant-Date Fair Value      
Granted $ 9.89 $ 6.99 $ 0.60
Employee Stock Option
     
Shares      
Outstanding at beginning of period 6.1 9.2 5.6
Granted 0.7 1.0 4.4
Exercised or vested (1.9) (3.6) (0.1)
Forfeited or expired (0.3) (0.5) (0.7)
Outstanding at end of period 4.6 6.1 9.2
Weighted- Average Exercise Price      
Outstanding at beginning of period $ 6.71 $ 4.87 $ 8.01
Granted $ 16.83 $ 11.74 $ 0.90
Exercised or vested $ 5.64 $ 3.33 $ 2.09
Forfeited or expired $ 8.67 $ 6.97 $ 5.05
Outstanding at end of period $ 8.56 $ 6.71 $ 4.87
SARs
     
Shares      
Outstanding at beginning of period 0.6 0.6 0.1
Granted 0.1 0.2 0.6
Exercised or vested (0.1) (0.1)  
Forfeited or expired (0.1) (0.1) (0.1)
Outstanding at end of period 0.5 0.6 0.6
Weighted- Average Exercise Price      
Outstanding at beginning of period $ 4.16 $ 1.00 $ 0.69
Granted $ 17.62 $ 11.34 $ 1.00
Exercised or vested $ 2.86 $ 0.69  
Forfeited or expired $ 6.44 $ 1.24 $ 0.51
Outstanding at end of period $ 8.13 $ 4.16 $ 1.00
Restricted Stock Units (RSUs)
     
Shares      
Outstanding at beginning of period 0.5 0.9 0.8
Granted 1.0 0.1 0.4
Exercised or vested (0.5) (0.5) (0.2)
Forfeited or expired (0.1)   (0.1)
Outstanding at end of period 0.9 0.5 0.9
Weighted-Average Grant-Date Fair Value      
Outstanding at beginning of period $ 7.44 $ 4.46 $ 5.10
Granted $ 16.92 $ 11.75 $ 2.33
Exercised or vested $ 8.36 $ 2.95 $ 2.13
Forfeited or expired $ 16.69   $ 7.17
Outstanding at end of period $ 16.51 $ 7.44 $ 4.46
PSUs
     
Shares      
Outstanding at beginning of period 0.3 0.2 0.4
Granted 0.3 0.5 0.2
Exercised or vested (0.1) (0.4) (0.3)
Forfeited or expired (0.1)   (0.1)
Outstanding at end of period 0.4 0.3 0.2
Weighted-Average Grant-Date Fair Value      
Outstanding at beginning of period $ 7.58 $ 0.74 $ 0.74
Granted $ 15.59 $ 11.37 $ 2.49
Exercised or vested $ 0.79 $ 6.54 $ 1.76
Forfeited or expired $ 15.83   $ 2.49
Outstanding at end of period $ 14.95 $ 7.58 $ 0.74