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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
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
 
 
March 31,
 
 
2017
 
2016
 
 
(in millions)
 
 
 
 
 
Service cost
 
$
0.8

 
$
0.7

Interest cost
 
6.8

 
7.3

Expected asset return
 
(10.5
)
 
(10.7
)
Amortized loss
 
1.7

 
1.4

Net periodic benefit credit
 
$
(1.2
)
 
$
(1.3
)
 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
 
March 31,
 
 
2017
 
2016
 
 
(in millions)
 
 
 

 
 

Service cost
 
$
0.1

 
$
0.1

Interest cost
 
3.3

 
3.5

Amortized loss
 
0.2

 
0.1

Amortized prior service credit
 
(0.7
)
 
(0.7
)
Net periodic benefit cost
 
$
2.9

 
$
3.0