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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables)
9 Months Ended
Sep. 30, 2019
Postemployment Benefits [Abstract]  
Schedule of Net Benefit Costs
The following are the components of defined benefit pension and OPEB costs:
Defined Benefit Pension Costs
 
(In Millions)
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
Service cost
$
4.6

 
$
4.7

 
$
12.9

 
$
14.0

Interest cost
8.9

 
7.6

 
26.2

 
22.7

Expected return on plan assets
(13.7
)
 
(15.0
)
 
(41.0
)
 
(45.0
)
Amortization:
 
 
 
 
 
 
 
Prior service costs
0.3

 
0.6

 
0.9

 
1.7

Net actuarial loss
5.9

 
5.3

 
17.7

 
15.9

Net periodic benefit cost
$
6.0

 
$
3.2

 
$
16.7

 
$
9.3


Other Postretirement Employment Benefits Credits
 
(In Millions)
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2019
 
2018
 
2019
 
2018
Service cost
$
0.5

 
$
0.6

 
$
1.3

 
$
1.6

Interest cost
2.3

 
2.1

 
7.0

 
6.2

Expected return on plan assets
(4.2
)
 
(4.6
)
 
(12.6
)
 
(13.8
)
Amortization:
 
 
 
 
 
 
 
Prior service credits
(0.5
)
 
(0.7
)
 
(1.5
)
 
(2.2
)
Net actuarial loss
1.3

 
1.3

 
3.8

 
3.8

Net periodic benefit credit
$
(0.6
)
 
$
(1.3
)
 
$
(2.0
)
 
$
(4.4
)