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Compensation Arrangements Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
Compensation Arrangements [Abstract]  
Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table Text Block]
The Deferred Compensation Agreement fair values were estimated using the Monte Carlo valuation model with the following assumptions:
 
Year Ended December 31,
  
2011
 
2010
 
2009
Exercise price of options connected to deferred compensation
$
19.50

 
$
19.50

 
$
19.50

Expected volatility
60
%
 
58
%
 
61
%
Expected dividend yield.
—
%
 
—
%
 
—
%
Risk-free rate over the estimated expected life
0.17
%
 
0.59
%
 
1.47
%
Expected life (in years)
1.5

 
2.0

 
2.6

Fair value (in millions)
$
8

 
$
7

 
$
5

Fair value of vested portion (in millions)
$
8

 
$
7

 
$
—
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The stock option fair values were estimated using the Black-Scholes valuation model with the following assumptions:
 
March 23, 2010 Valuation
 
December 31, 2009 Valuation
  
Plain Vanilla
Options
 
Options
Connected to
Deferred
Compensation
 
Plain Vanilla
Options
 
Options
Connected to
Deferred
Compensation
Exercise price
$
19.50

 
$
19.50

 
$
19.50

 
$
19.50

Options outstanding (in millions)
2

 
2

 
2

 
2

Expected volatility
58
%
 
58
%
 
61
%
 
61
%
Expected dividend yield
—
%
 
—
%
 
—
%
 
—
%
Risk-free rate over the estimated expected option life
1.18
%
 
1.18
%
 
1.41
%
 
1.47
%
Expected option life (in years)
2.4

 
2.4

 
2.5

 
2.6

Fair value of options (in millions)
$
13.7

 
$
13.7

 
$
12.0

 
$
12.2

Fair value of vested portion of options (in millions)
$
13.7

 
$
13.7

 
$
9.6

 
$
9.8