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POSTRETIREMENT BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2019
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, 2019 and 2018. 
 
2019
 
2018
For the Three Months Ended March 31
Pension
 
Other
Benefits
 
Total
 
Pension
 
Other
Benefits
 
Total
Service cost
 
$
0.4

 
 
 
$
0.2

 
 
 
$
0.6

 
 
 
$
0.4

 
 
 
$
0.2

 
 
 
$
0.6

 
Interest cost
 
3.1

 
 
 
1.0

 
 
 
4.1

 
 
 
2.8

 
 
 
1.1

 
 
 
3.9

 
Expected return on plan assets
 
(3.8
)
 
 
 
—

 
 
 
(3.8
)
 
 
 
(3.4
)
 
 
 
(0.1
)
 
 
 
(3.5
)
 
Amortization of prior service cost (benefit)
 
0.2

 
 
 
(1.3
)
 
 
 
(1.1
)
 
 
 
0.2

 
 
 
(1.3
)
 
 
 
(1.1
)
 
Amortization of net actuarial loss
 
1.3

 
 
 
0.6

 
 
 
1.9

 
 
 
1.5

 
 
 
1.1

 
 
 
2.6

 
Total net periodic benefit cost
 
$
1.2

 
 
 
$
0.5

 
 
 
$
1.7

 
 
 
$
1.5

 
 
 
$
1.0

 
 
 
$
2.5