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Incentive Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2011
Incentive Stock Plans [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following chart provides a tabular overview of the weighted average assumptions and related fair value calculations of options granted for the three years ended December 31, 2011:
 
2011
 
2010
 
2009
Expected volatility
38.2
%
 
37.8
%
 
34.1
%
Dividend yield
3.9
%
 
4.7
%
 
6.6
%
Risk-free rate
2.6
%
 
3.2
%
 
1.9
%
Expected life (in years)
6.5

 
6.7

 
6.6

Fair value per share of options granted
$
9.99

 
$
7.07

 
$
3.15

Fair value of options granted (in millions)
3.0

 
2.8

 
2.3

A summary of the status of the Company’s stock options as of and for the year ended December 31, 2011 is presented below:
 
2011
 
Number of
Shares
 
Weighted
Average Exercise
Price (per
common share)
 
Weighted
Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic
Value (in
millions)
Options outstanding at January 1,
2,633,158

 
$
24.90

 
 
 
 
Granted
296,490

 
37.05

 
 
 
 
Exercised
(572,283
)
 
23.61

 
 
 
 
Cancelled
(10,914
)
 
27.47

 
 
 
 
Options outstanding at December 31,
2,346,451

 
$
26.77

 
6.3

 
$
41.9

Options vested and expected to vest
2,344,871

 
$
26.77

 
6.3

 
$
41.9

Options exercisable at December 31,
1,711,739

 
$
25.80

 
5.7

 
$
32.2

A summary of additional information pertaining to the Company’s stock options is presented below:
 
2011
 
2010
 
2009
(Amounts in millions)
 
 
 
 
 
Intrinsic value of options exercised (a)
$
10.4

 
$
15.6

 
$
12.0

Fair value of options vested
$
2.5

 
$
2.4

 
$
2.5

(a)    Intrinsic value of options exercised is the amount by which the fair value of the stock on the exercise date exceeded the exercise price of the option.
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
A summary of the Company's performance share units is presented below:
 
2011
 
2010
 
2009
Common shares of Company stock reserved for performance shares
470,820

 
606,180

 
916,362

Weighted average fair value of performance share units granted
$
51.57

 
$
39.25

 
$
21.76

(Amounts in millions)
 
 
 
 
 
Intrinsic value of outstanding performance share units (a)
$
46.0

 
$
40.3

 
$
34.3

Fair value of performance shares vested
$
9.9

 
$
19.7

 
$
16.0

Cash used to pay the minimum withholding tax requirements in lieu of receiving common shares
$
7.1

 
$
5.3

 
$
1.4

(a)    Intrinsic value of outstanding performance share units is based on the market price of the Company's stock at December 31, 2011.

 
2011
 
Number
of Units
 
Weighted
Average Grant
Date Fair Value
Outstanding Performance Share units at January 1,
1,150,532

 
$
29.74

Granted
235,410

 
51.57

Units Distributed
(358,737
)
 
32.64

Cancelled/Adjustments
2,870

 
32.64

Outstanding Performance Share units at December 31,
1,030,075

 
33.73


Expected volatility and dividend yield were estimated using daily returns on the Company’s common stock for the three-year period ending on the grant date. The following chart provides a tabular overview of the assumptions used in calculating the fair value of the awards granted for the three years ended December 31, 2011:
 
2011
 
2010
 
2009
Expected volatility
51.3
%
 
51.7
%
 
43.6
%
Dividend yield
n/a

(a)
n/a

(a)
6.4
%
Risk-free rate
1.0
%
(b)
1.4
%
(b)
1.1
%
(a) The 2011 and 2010 awards receive dividend equivalents, so the dividend yield was not used to calculate the fair value.
(b) Based on the 3-year U.S. treasury rate on the date of the award.
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
A summary of the Company’s restricted shares is presented below:
 
2011
 
2010
 
2009
Restricted shares granted
20,535

 
42,180

 
22,907

Weighted average price of restricted shares granted
$
43.55

 
$
29.91

 
$
24.50

(Amounts in millions)
 
 
 
 
 
Intrinsic value of restricted stock outstanding (a)
$
3.4

 
$
4.9

 
$
5.9

Fair value of restricted stock vested
$
2.6

 
$
3.2

 
$
0.6

Cash used to pay the minimum withholding tax requirements in lieu of receiving common shares
$
0.8

 
$
0.8

 
$
—

(a)    Intrinsic value of restricted stock outstanding is based on the market price of the Company's stock at December 31, 2011.

 
2011
 
Number of
Shares
 
Weighted
Average Grant
Date Fair Value
Non-vested Restricted Shares at January 1,
140,675

 
$
30.09

Granted
20,535

 
43.55

Vested
(85,025
)
 
30.25

Non-vested Restricted Shares at December 31,
76,185

 
33.55