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Pension and Other Postemployment Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic expense of Pension and OPEB plans
The following table presents the components of net periodic expense (benefit) of the Company’s Pension and Other Postretirement plans:
 
Pension Benefits
 
Other Benefits
 
Three Months Ended March 31,
 
Three Months Ended March 31,
(in millions)
2014
 
2013
 
2014
 
2013
Service cost
$
0.3

 
$
0.6

 
$
—

 
$
—

Interest cost
1.7

 
1.7

 
—

 
—

Expected return on plan assets
(2.1
)
 
(2.2
)
 
—

 
—

Amortization of net loss (gain)
0.3

 
0.7

 
—

 
(3.2
)
Amortization of unrecognized prior service (credit)
(0.1
)
 
—

 
—

 
(0.5
)
Net periodic expense (benefit)
$
0.1

 
$
0.8

 
$
—

 
$
(3.7
)