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POSTRETIREMENT BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Net Periodic Benefit Cost of Pension Plans and Other Employee Related Benefit Plans The following tables provide the components of net periodic benefit cost for pension plans and other employee-related benefit plans for the three months ended March 31, 2017 and 2016. 
 
2017
 
2016
For the Three Months Ended March 31
Pension
 
Other
Benefits
 
Total
 
Pension
 
Other
Benefits
 
Total
Service cost
 
$
1.4

 
 
 
$
0.2

 
 
 
$
1.6

 
 
 
$
1.2

 
 
 
$
0.2

 
 
 
$
1.4

 
Interest cost
 
3.0

 
 
 
1.1

 
 
 
4.1

 
 
 
3.4

 
 
 
1.2

 
 
 
4.6

 
Expected return on plan assets
 
(4.6
)
 
 
 
(0.1
)
 
 
 
(4.7
)
 
 
 
(5.0
)
 
 
 
(0.2
)
 
 
 
(5.2
)
 
Amortization of prior service cost (benefit)
 
0.2

 
 
 
(1.4
)
 
 
 
(1.2
)
 
 
 
0.2

 
 
 
(1.6
)
 
 
 
(1.4
)
 
Amortization of net actuarial loss
 
1.7

 
 
 
1.1

 
 
 
2.8

 
 
 
1.9

 
 
 
1.2

 
 
 
3.1

 
Total net periodic benefit cost
 
$
1.7

 
 
 
$
0.9

 
 
 
$
2.6

 
 
 
$
1.7

 
 
 
$
0.8

 
 
 
$
2.5