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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2015
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 and nine months ended September 30:
 
 
Three Months
 
Nine Months
(in millions)
2015
 
2014
 
2015
 
2014
Service cost
$
1.2

 
$
1.1

 
$
3.6

 
$
3.2

Interest cost
14.3

 
15.2

 
42.9

 
45.6

Expected return on plan assets
(15.0
)
 
(13.4
)
 
(45.0
)
 
(40.2
)
Amortization of net pension loss
4.0

 
3.2

 
12.0

 
9.6

Total periodic pension cost
$
4.5

 
$
6.1

 
$
13.5

 
$
18.2