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EMPLOYEE BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Net Periodic Cost for Pension and Postretirement Benefit Plans
Net periodic cost for our pension and postretirement benefit plans was as follows: 
 
Pension Plans
 
Postretirement Plans
Three Months Ended March 31,
2014
 
2013
 
2014
 
2013
Service cost
$
0.9

 
$
1.2

 
$
0.2

 
$
0.2

Interest cost
10.9

 
9.9

 
2.0

 
1.7

Expected return on plan assets
(12.8
)
 
(13.6
)
 
(0.3
)
 
(0.4
)
Net amortization
—

 
—

 
(0.8
)
 
(0.8
)
Net periodic (benefit) cost
$
(1.0
)
 
$
(2.5
)
 
$
1.1

 
$
0.7