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EMPLOYEE BENEFIT PLANS (TABLES)
 6 Months Ended
Jun. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
Net periodic benefit costs recognized included the following components for the three months ended June 30 (in millions): 
 
Qualified
 
Nonqualified
 
Postretirement Medical
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost
$
9.5

 
$
9.0

 
$
0.2

 
$
0.2

 
$
1.3

 
$
1.5

Interest cost
18.3

 
18.3

 
0.5

 
0.5

 
1.3

 
1.8

Expected return on assets
(23.2
)
 
(22.1
)
 
—

 
—

 
—

 
—

Amortization of prior service cost
(0.3
)
 
(0.2
)
 
—

 
—

 
0.2

 
0.1

Recognized actuarial loss
9.9

 
6.1

 
0.2

 
0.2

 
(0.2
)
 
0.3

Net periodic benefit costs
$
14.2

 
$
11.1

 
$
0.9

 
$
0.9

 
$
2.6

 
$
3.7



Net periodic benefit costs recognized included the following components for the six months ended June 30 (in millions): 
 
Qualified
 
Nonqualified
 
Postretirement Medical
 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost
$
19.1

 
$
18.0

 
$
0.4

 
$
0.4

 
$
2.5

 
$
3.0

Interest cost
36.5

 
36.6

 
1.0

 
1.1

 
2.7

 
3.6

Expected return on assets
(46.5
)
 
(44.2
)
 
—

 
—

 
—

 
—

Amortization of prior service cost
(0.5
)
 
(0.4
)
 
—

 
—

 
0.3

 
0.2

Recognized actuarial loss
19.8

 
12.2

 
0.4

 
0.3

 
(0.3
)
 
0.6

Net periodic benefit costs
$
28.4

 
$
22.2

 
$
1.8

 
$
1.8

 
$
5.2

 
$
7.4