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STOCK-BASED COMPENSATION PLANS (TABLES)
 12 Months Ended
Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The table below summarizes the components of total stock-based compensation for the years ended December 31 (in millions):
 
2011
 
2010
 
2009
Stock options
$
3.0

 
$
4.0

 
$
4.3

Stock awards
7.7

 
8.8

 
5.8

Deferred stock awards
0.3

 
0.3

 
0.3

Employee stock purchase plan
0.6

 
0.6

 
1.5

Stock-based compensation
$
11.6

 
$
13.7

 
$
11.9

 
 
 
 
 
 
Tax benefit related to stock-based compensation
$
4.2

 
$
4.9

 
$
4.0
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
Unrecognized stock-based compensation for non-vested options and awards and the weighted-average period the expense will be recognized for the year ended December 31, 2011 (in millions):
 
Amount
 
Weighted-
Average
Period
Stock options
$
1.9

 
1.9

Stock awards
6.9

 
1.7

Unrecognized stock-based compensation
$
8.8

 
1.7
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of each option grant was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions used for grants in the years ended December 31:
 
2011
 
2010
 
2009
Expected volatility
56
%
 
55
%
 
52
%
Expected term
6
 years
 
6
 years
 
6
 years
Risk-free interest rate
2.26
%
 
2.78
%
 
2.01
%
Expected dividend yield
—

 
—

 
—

Weighted-average grant date fair value per share
$
32.79

 
$
18.05

 
$
14.00

Estimated fair value of options granted (millions)
$
2.4

 
$
2.3

 
$
5.5
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The tables below summarize stock option activity for the year ended December 31, 2011:
 
Shares
 
Weighted-
Average
Exercise
Price
Per Share
 
Weighted-
Average
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value (in
millions)
Outstanding, December 31, 2010
1,146,520

 
$
30.27

 
6.4

 
$
30.3

Granted
73,861

 
61.23

 
 
 
 
Exercised
(562,883
)
 
30.00

 
 
 
 
Forfeited or expired
(6,700
)
 
28.13

 
 
 
 
Outstanding, December 31, 2011
650,798

 
$
34.03

 
6.5

 
$
26.7

 
 
 
 
 
 
 
 
Exercisable, December 31, 2011
176,203

 
$
35.51

 
5.2

 
$
7.0

Vested or expected to vest, December 31, 2011
647,590

 
$
34.03

 
6.5

 
$
26.6


 
2011
 
2010
 
2009
Intrinsic value of option exercises
$
19.9

 
$
22.8

 
$
1.6

Cash received from stock option exercises
16.8

 
37.4

 
8.3

Tax benefit related to stock option exercises
7.5

 
8.6

 
0.6

Fair value of options vested
3.4

 
3.9

 
4.4
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The following table summarizes information about outstanding stock awards:
 
Number
of Units
 
Weighted-
Average
Grant
Date Fair
Value
 
Weighted-
Average
Contractual
Life (Years)
 
Aggregate
Intrinsic
Value (in
millions)
Non-vested, December 31, 2010
568,085

 
$
29.55

 
1.1

 
$
32.2

Granted
117,406

 
61.28

 
 

 
 

Vested
(260,957
)
 
22.87

 
 

 
 

Forfeited
(26,714
)
 
32.61

 
 

 
 

Non-vested, December 31, 2011
397,820

 
$
39.54

 
1.0

 
$
29.9