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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Net Benefit (Credits) Costs [Table Text Block]
The components of net periodic benefit cost (credit) are as follows:

 
 
Pension Benefits
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
(in millions)
 
 
 
 
 
 
 
 
 
Service cost
 
$
0.8

 
$
0.8

 
$
2.3

 
$
2.4

Interest cost
 
7.3

 
7.2

 
21.9

 
21.6

Expected asset return
 
(10.7
)
 
(10.6
)
 
(32.1
)
 
(31.8
)
Amortized loss
 
1.3

 
1.5

 
4.1

 
4.5

Net periodic benefit credit
 
$
(1.3
)
 
$
(1.1
)
 
$
(3.8
)
 
$
(3.3
)
 
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
(in millions)
 
 
 

 
 

 
 
 
 
Service cost
 
$
0.1

 
$
0.1

 
$
0.3

 
$
0.3

Interest cost
 
3.5

 
3.8

 
10.5

 
11.4

Amortized loss
 
0.1

 
0.2

 
0.3

 
0.6

Amortized prior service credit
 
(0.7
)
 
(0.7
)
 
(2.0
)
 
(2.1
)
Net periodic benefit cost
 
$
3.0

 
$
3.4

 
$
9.1

 
$
10.2