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POSTRETIREMENT BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016 and 2015. 
 
2016
 
2015
Three Months Ended March 31
Pension
 
Other
Benefits
 
Total
 
Pension
 
Other
Benefits
 
Total
Service cost
 
$
1.2

 
 
 
$
0.2

 
 
 
$
1.4

 
 
 
$
1.3

 
 
 
$
0.2

 
 
 
$
1.5

 
Interest cost
 
3.4

 
 
 
1.2

 
 
 
4.6

 
 
 
3.6

 
 
 
1.2

 
 
 
4.8

 
Expected return on plan assets
 
(5.0
)
 
 
 
(0.2
)
 
 
 
(5.2
)
 
 
 
(5.1
)
 
 
 
(0.2
)
 
 
 
(5.3
)
 
Amortization of prior service cost (benefit)
 
0.2

 
 
 
(1.6
)
 
 
 
(1.4
)
 
 
 
0.2

 
 
 
(2.7
)
 
 
 
(2.5
)
 
Amortization of net actuarial loss
 
1.9

 
 
 
1.2

 
 
 
3.1

 
 
 
2.1

 
 
 
1.1

 
 
 
3.2

 
Total net periodic benefit cost
 
$
1.7

 
 
 
$
0.8

 
 
 
$
2.5

 
 
 
$
2.1

 
 
 
$
(0.4
)
 
 
 
$
1.7