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Stock-Based Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Stock-Based Incentive Plans [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
The following table summarizes the Company's stock-based compensation expense included as a component of general and administrative expenses in the consolidated financial statements:
 
Year Ended December 31,
 
2011
 
2010
 
2009
 
(In millions)
Total stock-based compensation:
 
 
 
 
 
Pre-tax compensation expense
$
10.6

 
$
15.2

 
$
10.7

Book tax benefit
(4.2
)
 
(6.0
)
 
(4.2
)
Total stock-based compensation expense, net of tax
$
6.4

 
$
9.2

 
$
6.5
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
Stock option activity for the years ended December 31, 2011, 2010 and 2009 is summarized as follows:
Shares Under Stock Option
Number of
Shares
 
Weighted Average
Exercise Price
Per Share
 
Weighted Average
Remaining Contractual
Term (in Years)
 
Aggregate Intrinsic
Value
Outstanding at December 31, 2008
933,939

 
$
36.37

 
 

 
 

Granted
1,016,750

 
8.22

 
 

 
 

Exercised
(15,500
)
 
20.87

 
 

 
 

Forfeited
(222,923
)
 
20.35

 
 

 
 

Expired
(53,166
)
 
40.07

 
 

 
 

Outstanding at December 31, 2009
1,659,100

 
21.30

 
 

 
 

Granted
415,804

 
31.26

 
 

 
 

Exercised
(475,705
)
 
16.75

 
 

 
 

Forfeited
(50,222
)
 
25.84

 
 

 
 

Expired
(25,267
)
 
44.93

 
 

 
 

Outstanding at December 31, 2010
1,523,710

 
24.90

 
 

 
 

Granted
233,449

 
53.04

 
 

 
 

Exercised
(393,075
)
 
17.11

 
 

 
 

Forfeited
(42,593
)
 
27.89

 
 

 
 

Expired
(2,851
)
 
47.08

 
 

 
 

Outstanding at December 31, 2011
1,318,640

 
$
32.06

 
6.74

 
$
17,110,000

Vested and Expected to Vest at December 31, 2011
1,143,491

 
$
32.75

 
6.53

 
$
13,980,000

Exercisable at December 31, 2011
620,687

 
$
34.21

 
5.07

 
$
5,980,000
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following table summarizes the assumptions used to value options granted in the respective periods:
 
2011
 
2010
 
2009
Risk free interest rate
1.8
%
 
2.2
%
 
2.0
%
Weighted average historical volatility
79.1
%
 
80.4
%
 
72.3
%
Dividend yield
—
%
 
—
%
 
—
%
Expected years until exercise
4.6

 
4.8

 
5.0

Forfeitures
11.0
%
 
11.0
%
 
11.0
%
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Restricted stock and restricted stock unit activity for the years ended December 31, 2011, 2010 and 2009 is set forth below:
 
Number of
Shares
 
Weighted
Average
Grant-Date Per
Share
Fair Value
 
Restricted
Stock Units
 
Weighted
Average
Grant-Date
Per Share
Fair Value
Outstanding at December 31, 2008
671,480

 
$
45.07

 
—

 
—

Granted
241,125

 
10.92

 
—

 
—

Released
(139,649
)
 
51.40

 
—

 
—

Forfeited
(122,633
)
 
34.23

 
—

 
—

Outstanding at December 31, 2009
650,323

 
33.09

 
—

 
—

Granted
209,505

 
30.52

 
20,000

 
$
29.32

Released
(159,893
)
 
48.18

 
(2,000
)
 
29.32

Forfeited
(33,691
)
 
34.16

 
—

 
—

Outstanding at December 31, 2010
666,244

 
28.62

 
18,000

 
29.32

Granted
164,632

 
53.03

 
—

 
—

Released
(287,735
)
 
37.82

 
—

 
—

Forfeited
(56,608
)
 
31.56

 
—

 
—

Outstanding at December 31, 2011
486,533

 
31.08

 
18,000

 
29.32