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Pension and Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Components Of Net Periodic Cost
The components of net periodic benefit are as follows:
 
Three Months Ended March 31,
 
2015
 
2014
 
2015
 
2014
(in millions)
Pension Benefits
 
Other Postretirement
Benefits
Service cost
$
1.4

 
$
1.3

 
$
—

 
$
—

Interest cost
9.6

 
10.2

 
0.1

 
0.1

Expected return on plan assets
(15.6
)
 
(15.7
)
 
—

 
—

Amortization of prior service cost
—

 
—

 
(0.1
)
 
(0.1
)
Amortization of net loss (gain)
3.1

 
1.3

 
(0.1
)
 
—

Net periodic benefit
$
(1.5
)
 
$
(2.9
)
 
$
(0.1
)
 
$
—