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POSTRETIREMENT BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 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 and nine months ended September 30, 2018 and 2017. 
 
2018
 
2017
For the Three Months Ended September 30
Pension
 
Other
Benefits
 
Total
 
Pension
 
Other
Benefits
 
Total
Service cost
 
$
0.4

 
 
 
$
0.2

 
 
 
$
0.6

 
 
 
$
0.8

 
 
 
$
0.2

 
 
 
$
1.0

 
Interest cost
 
3.0

 
 
 
1.0

 
 
 
4.0

 
 
 
3.0

 
 
 
1.1

 
 
 
4.1

 
Expected return on plan assets(a)
 
(4.4
)
 
 
 
—

 
 
 
(4.4
)
 
 
 
(3.9
)
 
 
 
(0.1
)
 
 
 
(4.0
)
 
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

 
 
 
0.9

 
 
 
2.4

 
 
 
2.1

 
 
 
1.1

 
 
 
3.2

 
Net periodic benefit cost
 
0.7

 
 
 
0.8

 
 
 
1.5

 
 
 
2.2

 
 
 
0.9

 
 
 
3.1

 
Loss from settlement or curtailment
 
1.4

 
 
 
—

 
 
 
1.4

 
 
 
3.7

 
 
 
—

 
 
 
3.7

 
Total net periodic benefit cost
 
$
2.1

 
 
 
$
0.8

 
 
 
$
2.9

 
 
 
$
5.9

 
 
 
$
0.9

 
 
 
$
6.8

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2018
 
2017
For the Nine Months Ended September 30
Pension
 
Other
Benefits
 
Total
 
Pension
 
Other
Benefits
 
Total
Service cost
 
$
1.2

 
 
 
$
0.6

 
 
 
$
1.8

 
 
 
$
2.0

 
 
 
$
0.6

 
 
 
$
2.6

 
Interest cost
 
8.6

 
 
 
3.2

 
 
 
11.8

 
 
 
9.0

 
 
 
3.4

 
 
 
12.4

 
Expected return on plan assets(a)
 
(11.2
)
 
 
 
(0.2
)
 
 
 
(11.4
)
 
 
 
(11.4
)
 
 
 
(0.3
)
 
 
 
(11.7
)
 
Amortization of prior service cost (benefit)
 
0.6

 
 
 
(3.9
)
 
 
 
(3.3
)
 
 
 
0.7

 
 
 
(4.3
)
 
 
 
(3.6
)
 
Amortization of net actuarial loss
 
4.5

 
 
 
3.1

 
 
 
7.6

 
 
 
5.6

 
 
 
3.2

 
 
 
8.8

 
Net periodic benefit cost
 
3.7

 
 
 
2.8

 
 
 
6.5

 
 
 
5.9

 
 
 
2.6

 
 
 
8.5

 
Loss from settlement or curtailment
 
1.4

 
 
 
—

 
 
 
1.4

 
 
 
3.7

 
 
 
—

 
 
 
3.7

 
Total net periodic benefit cost
 
$
5.1

 
 
 
$
2.8

 
 
 
$
7.9

 
 
 
$
9.6

 
 
 
$
2.6

 
 
 
$
12.2

 
(a)
Plan administrative expenses of $0.7 and $2.3 for the three and nine months ended September 30, 2017, respectively have been reclassified from the service cost component line to the expected return on plan assets component line to conform to the current year presentation.