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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)
 6 Months Ended
Jun. 30, 2015
Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The components of Pension Expense for the six and three months ended June 30, 2015 and 2014 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2015
 
Jun 30,
2014
 
Jun 30,
2015
 
Jun 30,
2014
Service Cost Earned
 
$
5.2

 
$
4.4

 
$
2.6

 
$
2.2

Interest Cost on Projected Benefit Obligation
 
12.8

 
12.4

 
6.4

 
6.2

Expected Return on Plan Assets
 
(17.5
)
 
(17.5
)
 
(8.7
)
 
(8.8
)
Amortization of Accumulated Net Unrecognized Pension Costs
 
12.2

 
4.8

 
6.4

 
2.5

Total Pension Expense Recognized
 
$
12.7

 
$
4.1

 
$
6.7

 
$
2.1
Postretirement Benefits Other than Pensions [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The components of Postretirement Benefits Other than Pensions Expense (Benefit) for the six and three months ended June 30, 2015 and 2014 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2015
 
Jun 30,
2014
 
Jun 30,
2015
 
Jun 30,
2014
Service Cost on Benefits Earned
 
$
0.1

 
$
0.1

 
$
0.1

 
$
—

Interest Cost on Projected Benefit Obligation
 
0.5

 
0.6

 
0.2

 
0.3

Amortization of Accumulated Net Unrecognized Gain
 
(0.7
)
 
(0.9
)
 
(0.3
)
 
(0.6
)
Total Postretirement Benefits Other than Pensions Expense (Benefit)
 
$
(0.1
)
 
$
(0.2
)
 
$
—

 
$
(0.3
)