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Pension and Postretirement Plans (Tables)
 3 Months Ended
Mar. 31, 2017
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
For the three months ended March 31, 2017 and 2016, pension and postretirement benefit costs (benefits) were as follows:
 
Three Months Ended March 31,
 
2017
 
2016
 
2017
 
2016
(dollars in millions)
Pension Benefits
 
Postretirement and
Other Benefits
Service cost
$
—

 
$
—

 
$
0.1

 
$
0.1

Interest cost on projected benefit obligation
4.8

 
4.8

 
0.8

 
0.8

Expected return on plan assets
(6.5
)
 
(6.8
)
 
—

 
—

Amortization of:
 
 
 
 
 
 
 
Prior service benefit
—

 
—

 
(1.1
)
 
(3.7
)
Actuarial loss
4.4

 
4.8

 
1.1

 
1.2

       Total amortization
4.4

 
4.8

 
—

 
(2.5
)
Pension / postretirement costs (benefits)
$
2.7

 
$
2.8

 
$
0.9

 
$
(1.6
)