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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
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)
2016
 
2015
 
2016
 
2015
Service cost
$
1.6

 
$
1.2

 
$
4.8

 
$
3.6

Interest cost
14.0

 
14.3

 
42.0

 
42.9

Expected return on plan assets
(14.2
)
 
(15.0
)
 
(42.4
)
 
(45.0
)
Amortization of net pension loss
3.5

 
4.0

 
10.3

 
12.0

Total periodic pension cost
$
4.9

 
$
4.5

 
$
14.7

 
$
13.5