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Pension and Post-retirement Benefit Plans Pension and Post-retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic benefit cost
The components of net periodic benefit cost were as follows (in millions):
 
For the Three Months Ended March 31,
 
2015
 
2014
 
2015
 
2014
 
Pension Benefits
 
Other Benefits
Service cost
$
1.2

 
$
1.1

 
$
—

 
$
—

Interest cost
4.3

 
4.4

 
—

 
—

Expected return on plan assets
(5.3
)
 
(5.7
)
 
—

 
—

Amortization of prior service cost
—

 
0.1

 
(0.8
)
 
(0.8
)
Recognized actuarial loss
2.4

 
1.6

 
0.4

 
0.4

Settlements and curtailments
0.3

 
—

 
—

 
—

Net periodic benefit cost (1)
$
2.9

 
$
1.5

 
$
(0.4
)
 
$
(0.4
)

(1) All net periodic benefit cost for the three months ended March 31, 2015 and 2014 related to continuing operations.