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EMPLOYEE BENEFITS (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of the components of net periodic benefit cost
The following tables show the components of net periodic pension and OPEB costs for our benefit plans.
 
 
Pension Costs
 
 
Three Months Ended June 30
 
Six Months Ended June 30
(in millions)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
10.4

 
$
10.7

 
$
22.1

 
$
22.0

Interest cost
 
30.2

 
33.0

 
61.4

 
66.2

Expected return on plan assets
 
(48.5
)
 
(49.0
)
 
(98.1
)
 
(98.0
)
Loss on plan settlement
 
5.3

 
14.1

 
5.3

 
14.1

Amortization of prior service cost
 
0.8

 
0.8

 
1.5

 
1.7

Amortization of net actuarial loss
 
21.1

 
20.2

 
43.0

 
40.7

Net periodic benefit cost
 
$
19.3

 
$
29.8

 
$
35.2

 
$
46.7


 
 
OPEB Costs
 
 
Three Months Ended June 30
 
Six Months Ended June 30
(in millions)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
5.6

 
$
6.4

 
$
11.9

 
$
13.1

Interest cost
 
8.4

 
9.3

 
16.9

 
18.5

Expected return on plan assets
 
(13.6
)
 
(13.3
)
 
(27.3
)
 
(26.4
)
Amortization of prior service credit
 
(2.8
)
 
(2.4
)
 
(5.6
)
 
(4.7
)
Amortization of net actuarial loss
 
0.1

 
1.9

 
1.6

 
4.2

Net periodic benefit (credit) cost
 
$
(2.3
)
 
$
1.9

 
$
(2.5
)
 
$
4.7