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Employee Benefits (Tables)
3 Months Ended
Mar. 31, 2013
Compensation and Retirement Disclosure [Abstract]  
Schedule of Costs of Retirement Plans [Table Text Block]
The following table presents the components of our company-sponsored pension costs for the three months ended March 31:
 
(in millions)
2013
 
2012
Service cost
$
1.1

 
$
1.0

Interest cost
14.0

 
14.8

Expected return on plan assets
(13.9
)
 
(11.6
)
Amortization of net loss
3.7

 
2.9

Total periodic pension cost
$
4.9

 
$
7.1