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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
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,
 
 
2019
 
2018
 
2019
 
2018
 
 
(in millions)
 
 
 
 
 
 
 
 
 
Service cost
 
$
0.4

 
$
1.1

 
$
1.1

 
$
3.2

Interest cost
 
7.1

 
6.9

 
21.3

 
20.6

Expected asset return
 
(10.3
)
 
(11.4
)
 
(30.9
)
 
(34.4
)
Amortized loss
 
1.5

 
2.2

 
4.7

 
6.6

Amortized prior service cost
 
—

 
—

 
—

 
0.1

Curtailment
 
—

 
—

 
—

 
3.2

Settlement
 
0.4

 
—

 
0.4

 
—

Net periodic benefit credit
 
$
(0.9
)
 
$
(1.2
)
 
$
(3.4
)
 
$
(0.7
)
 
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2019
 
2018
 
2019
 
2018
 
 
(in millions)
 
 
 

 
 

 
 
 
 
Service cost
 
$
—

 
$
0.1

 
$
0.2

 
$
0.3

Interest cost
 
3.3

 
3.1

 
9.7

 
9.3

Amortized loss
 
—

 
0.2

 
0.1

 
0.6

Amortized prior service credit
 
(0.4
)
 
(0.7
)
 
(1.2
)
 
(2.0
)
Net periodic benefit cost
 
$
2.9

 
$
2.7

 
$
8.8

 
$
8.2