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Employee Benefits (Tables)
 6 Months Ended
Jun. 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 six months ended June 30:
 
 
Three Months
 
Six Months
(in millions)
2015
 
2014
 
2015
 
2014
Service cost
$
1.2

 
$
1.1

 
$
2.4

 
$
2.1

Interest cost
14.3

 
15.2

 
28.6

 
30.4

Expected return on plan assets
(15.0
)
 
(13.4
)
 
(30.0
)
 
(26.8
)
Amortization of net pension loss
4.0

 
3.2

 
8.0

 
6.4

Total periodic pension cost
$
4.5

 
$
6.1

 
$
9.0

 
$
12.1