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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
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
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(in millions)
 
 
 
 
 
 
 
 
 
Service cost
 
$
1.0

 
$
1.1

 
$
2.1

 
$
1.9

Interest cost
 
6.8

 
7.4

 
13.7

 
14.2

Expected asset return
 
(11.5
)
 
(11.1
)
 
(23.0
)
 
(21.6
)
Amortized loss
 
2.2

 
1.8

 
4.4

 
3.5

Amortized prior service cost
 
0.1

 
—

 
0.1

 
—

Curtailment
 
—

 
—

 
3.2

 
—

Net periodic benefit cost (credit)
 
$
(1.4
)
 
$
(0.8
)
 
$
0.5

 
$
(2.0
)
 
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(in millions)
 
 
 

 
 

 
 
 
 
Service cost
 
$
0.1

 
$
0.1

 
$
0.2

 
$
0.2

Interest cost
 
3.1

 
3.3

 
6.2

 
6.6

Amortized loss
 
0.2

 
0.1

 
0.4

 
0.3

Amortized prior service credit
 
(0.6
)
 
(0.6
)
 
(1.3
)
 
(1.3
)
Net periodic benefit cost
 
$
2.8

 
$
2.9

 
$
5.5

 
$
5.8