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POSTRETIREMENT BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost of Pension Plans and Other Employee Related Benefit Plans
The following table provides the components of net periodic benefit cost for pension plans and other employee-related benefit plans for the three months ended March 31, 2018 and 2017. 
 
2018
 
2017
For the Three Months Ended March 31
Pension
 
Other
Benefits
 
Total
 
Pension
 
Other
Benefits
 
Total
Service cost
 
$
0.4

 
 
 
$
0.2

 
 
 
$
0.6

 
 
 
$
0.6

 
 
 
$
0.2

 
 
 
$
0.8

 
Interest cost
 
2.8

 
 
 
1.1

 
 
 
3.9

 
 
 
3.0

 
 
 
1.1

 
 
 
4.1

 
Expected return on plan assets(a)
 
(3.4
)
 
 
 
(0.1
)
 
 
 
(3.5
)
 
 
 
(3.8
)
 
 
 
(0.1
)
 
 
 
(3.9
)
 
Amortization of prior service cost (benefit)
 
0.2

 
 
 
(1.3
)
 
 
 
(1.1
)
 
 
 
0.2

 
 
 
(1.4
)
 
 
 
(1.2
)
 
Amortization of net actuarial loss
 
1.5

 
 
 
1.1

 
 
 
2.6

 
 
 
1.7

 
 
 
1.1

 
 
 
2.8

 
Total net periodic benefit cost
 
$
1.5

 
 
 
$
1.0

 
 
 
$
2.5

 
 
 
$
1.7

 
 
 
$
0.9

 
 
 
$
2.6

 
(a)
Includes plan administrative expenses of $0.9 and $0.8 for the three months ended March 31, 2018 and 2017, respectively. The prior year plan administrative expenses have been reclassified from the service cost component line to conform to the current year presentation.