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Pension and Post-retirement Benefit Plans Pension and Post-retirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
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 June 30,
 
2013
 
2012
 
2013
 
2012
 
Pension Benefits
 
Other Benefits
Service cost
$
1.2

 
$
1.3

 
$
—

 
$
—

Interest cost
4.2

 
4.3

 
—

 
0.1

Expected return on plan assets
(5.4
)
 
(4.7
)
 
—

 
—

Amortization of prior service cost
0.1

 
0.1

 
(0.7
)
 
(0.8
)
Recognized actuarial loss
2.3

 
2.1

 
0.4

 
0.4

Settlements and curtailments
0.7

 
6.3

 
—

 
—

Net periodic benefit cost (1)
$
3.1

 
$
9.4

 
$
(0.3
)
 
$
(0.3
)

 
For the Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
Pension Benefits
 
Other Benefits
Service cost
$
2.6

 
$
2.7

 
$
—

 
$
0.3

Interest cost
8.3

 
8.6

 
0.1

 
0.3

Expected return on plan assets
(10.6
)
 
(9.4
)
 
—

 
—

Amortization of prior service cost
0.2

 
0.2

 
(1.5
)
 
(1.3
)
Recognized actuarial loss
4.6

 
4.3

 
0.7

 
0.7

Settlements and curtailments
1.2

 
6.3

 
—

 
—

Net periodic benefit cost (1)
$
6.3

 
$
12.7

 
$
(0.7
)
 
$
—


(1) Pension Expense of $0.1 million was included in Loss from discontinued operations for the three and six months ended June 30, 2013. Pension expense of $6.3 million was included in Loss from discontinued operations for the three and six months ended June 30, 2012.