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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(in millions)
 
 
 
 
 
 
 
 
 
Service cost
 
$
1.1

 
$
0.7

 
$
3.2

 
$
2.6

Interest cost
 
6.9

 
7.2

 
20.6

 
21.4

Expected asset return
 
(11.4
)
 
(11.1
)
 
(34.4
)
 
(32.7
)
Amortized loss
 
2.2

 
1.9

 
6.6

 
5.4

Amortized prior service cost (credit)
 
—

 
(0.1
)
 
0.1

 
(0.1
)
Curtailment
 
—

 
—

 
3.2

 
—

Settlement
 
—

 
2.9

 
—

 
2.9

Net periodic benefit cost (credit)
 
$
(1.2
)
 
$
1.5

 
$
(0.7
)
 
$
(0.5
)
 
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
(in millions)
 
 
 

 
 

 
 
 
 
Service cost
 
$
0.1

 
$
0.1

 
$
0.3

 
$
0.3

Interest cost
 
3.1

 
3.3

 
9.3

 
9.9

Amortized loss
 
0.2

 
0.2

 
0.6

 
0.5

Amortized prior service credit
 
(0.7
)
 
(0.8
)
 
(2.0
)
 
(2.1
)
Net periodic benefit cost
 
$
2.7

 
$
2.8

 
$
8.2

 
$
8.6