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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
Share-based Compensation [Abstract]  
Schedule Of Stock-Based Compensation Expense
Total compensation expense recognized in the consolidated financial statements for all share based awards, was as follows (in millions):
 
Years Ended December 31,
 
2011
 
2010
 
2009
Stock-based compensation expense
$
5.6

 
$
5.9

 
$
3.5
Schedule of Restricted Share Awards [Table Text Block]
Restricted Share Awards
 
2011
 
2010
 
2009
 
Shares
 
Wtd Avg Grant Fair Value
 
Shares
 
Wtd Avg Grant Fair Value
 
Shares
 
Wtd Avg Grant Fair Value
Vested at January 1
490,832

 
$
30.20

 
423,145

 
$
30.24

 
340,920

 
$
29.70

Unvested at January 1
193,339

 
$
27.71

 
160,276

 
$
28.13

 
141,411

 
$
31.72

Granted
303,168

 
$
29.48

 
101,870

 
$
28.37

 
102,841

 
$
26.67

Vested during year
(161,971
)
 
$
29.80

 
(67,687
)
 
$
30.01

 
(82,225
)
 
$
32.44

Forfeited
(3,533
)
 
$
28.10

 
(1,120
)
 
$
28.45

 
(1,751
)
 
$
29.77

Unvested at December 31
331,003

 
$
28.39

 
193,339

 
$
27.71

 
160,276

 
$
28.13

Vested at December 31
652,803

 
$
30.06

 
490,832

 
$
30.20

 
423,145

 
$
30.24
Fair Value of Share Grants Vested
The total fair value of share grants vested was as follows (in millions):
 
Years Ended December 31,
 
2011
 
2010
 
2009
Fair value of share grants vested
$
4.9

 
$
2.1

 
$
1.9
Performance Share Units with Market Conditions [Table Text Block]
Stock based awards with market conditions under the New LTIP were granted in February 2011 with fair market values, as determined using a Monte Carlo simulation, as follows (in thousands):
 
Grant Date Fair Value
 
Restricted
 
Unrestricted
Relative TSR
$
1,066

 
$
1,066

Absolute TSR
$
365

 
$
365
Schedule Of Unamortized Value Of Awards With Market Conditions [Table Text Block]
The unamortized value of these awards with market conditions as of December 31, 2011 was as follows (in thousands):
 
Unamortized Value at
December 31, 2011
 
 
Restricted
 
Unrestricted
Relative TSR
$
742

 
$
826

Absolute TSR
$
254

 
$
283
Schedule of Share-based Compensation, Stock Options, Activity
The following chart details the previously issued and currently outstanding and exercisable stock options:
 
2011
 
2010
 
2009
 
Shares
 
Wtd Avg
Ex Price
 
Shares
 
Wtd Avg
Ex Price
 
Shares
 
Wtd Avg
Ex Price
Outstanding at January 1
145,950

 
$
26.74

 
314,250

 
$
25.39

 
317,000

 
$
25.31

Granted
—

 
$
—

 
—

 
$
—

 
—

 
$
—

Exercised
(51,081
)
 
$
25.29

 
(164,300
)
 
$
24.11

 
(2,750
)
 
$
16.34

Expired/Forfeited
(5,763
)
 
$
24.85

 
(4,000
)
 
$
28.23

 
—

 
$
—

Outstanding at December 31
89,106

 
$
27.69

 
145,950

 
$
26.74

 
314,250

 
$
25.39

Exercisable at December 31
89,106

 
$
27.69

 
145,950

 
$
26.74

 
314,250

 
$
25.39