Pension Benefits and Postretirement Benefits Other Than Pensions (Tables)

3 Months Ended

Mar. 31, 2016

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 Pension Plan for the three months endedMarch 31, 2016 and 2015 were:

	Three Months Ended
(Dollars in Millions)	Mar 31, 2016			Mar 31, 2015
Service Cost Earned	$	2.2		$	2.6
Interest Cost on Projected Benefit Obligation	5.4			6.4
Expected Return on Plan Assets	(8.2		)	(8.8		)
Amortization of Accumulated Net Unrecognized Pension Costs	3.0			5.8
Total Pension Expense Recognized	$	2.4		$	6.0

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 OPEB Plan for the three months endedMarch 31, 2016 and 2015 were:

	Three Months Ended
(Dollars in Millions)	Mar 31, 2016			Mar 31, 2015
Service Cost Earned	$	—		$	—
Interest Cost on Projected Benefit Obligation	0.2			0.3
Amortization of Accumulated Net Unrecognized Gain	(0.3		)	(0.4		)
Total Postretirement Benefits Other than Pensions Expense (Benefit)	$	(0.1	)	$	(0.1	)