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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2011
Employee Benefit Plans 
Components of net periodic pension cost

 

 

 

 

 

Three Months Ended September 30,

 

Nine Months Ended September 30,

 

 

 

2011

 

2010

 

2011

 

2010

 

Service cost

 

$

1.6

 

$

1.3

 

$

3.9

 

$

3.3

 

Interest cost

 

1.8

 

1.5

 

4.6

 

4.0

 

Expected return on plan assets

 

(1.1

)

(0.9

)

(2.9

)

(2.7

)

Amortization of prior service costs

 

0.2

 

—

 

0.2

 

0.5

 

Net periodic benefit costs

 

$

2.5

 

$

1.9

 

$

5.8

 

$

5.1