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Pension and Post retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2012
Pension and Post retirement Plans [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost recorded for the second quarters of 2012 and 2011 were as follows (in millions):

Pension Benefits
Post-retirement Benefits
2012
2011
2012
2011
Service cost
$
0.3
$
0.9
$
--
$
0.1
Interest cost
1.7
2.3
0.1
0.2
Expected return on plan assets
(2.4
)
(2.9
)
--
--
Amortization of prior service cost
(0.5
)
0.2
--
--
Amortization of net loss
2.4
1.2
(0.1
)
--
Net periodic benefit cost
$
1.5
$
1.7
$
--
$
0.3

The components of net periodic benefit cost recorded for the first half of 2012 and 2011 were as follows (in millions):

Pension Benefits
Post-retirement Benefits
2012
2011
2012
2011
Service cost
$
1.2
$
1.8
$
0.1
$
0.2
Interest cost
4.1
4.6
0.3
0.4
Expected return on plan assets
(5.2
)
(5.8
)
--
--
Amortization of prior service cost
(0.4
)
0.4
--
--
Amortization of net loss
4.0
2.4
(0.1
)
--
Net periodic benefit cost
$
3.7
$
3.4
$
0.3
$
0.6