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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(in millions)
 
 
 
 
 
 
 
 
 
Service cost
 
$
0.7

 
$
0.8

 
$
2.6

 
$
2.3

Interest cost
 
7.2

 
7.3

 
21.4

 
21.9

Expected asset return
 
(11.1
)
 
(10.7
)
 
(32.7
)
 
(32.1
)
Amortized loss
 
1.9

 
1.3

 
5.4

 
4.1

Amortized prior service cost (credit)
 
(0.1
)
 
—

 
(0.1
)
 
—

Settlement
 
2.9

 
—

 
2.9

 
—

Net periodic benefit cost (credit)
 
$
1.5

 
$
(1.3
)
 
$
(0.5
)
 
$
(3.8
)
 
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(in millions)
 
 
 

 
 

 
 
 
 
Service cost
 
$
0.1

 
$
0.1

 
$
0.3

 
$
0.3

Interest cost
 
3.3

 
3.5

 
9.9

 
10.5

Amortized loss
 
0.2

 
0.1

 
0.5

 
0.3

Amortized prior service credit
 
(0.8
)
 
(0.7
)
 
(2.1
)
 
(2.0
)
Net periodic benefit cost
 
$
2.8

 
$
3.0

 
$
8.6

 
$
9.1