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Pension Benefits and Postretirement Benefits Other Than Pensions (Tables) | 6 Months Ended
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Jun. 30, 2013
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, 2013 and 2012 were:
|  | Six Months Ended |  | Three Months Ended
(Dollars in Millions) |  | June 30, 2013 |  | June 30, 2012 |  | June 30, 2013 |  | June 30, 2012
Service Cost Earned |  | $ | 5.4 |  |  | $ | 5.6 |  |  | $ | 2.7 |  |  | $ | 2.6 |
Interest Cost on Projected Benefit Obligation |  | 11.2 |  |  | 11.2 |  |  | 5.7 |  |  | 5.6 |
Expected Return on Plan Assets |  | (14.9 | ) |  | (14.9 | ) |  | (7.5 | ) |  | (7.5 | )
Amortization of Accumulated Unrecognized Actuarial Loss |  | 13.1 |  |  | 9.4 |  |  | 7.2 |  |  | 4.9 |
Total Pension Expense Recognized |  | $ | 14.8 |  |  | $ | 11.3 |  |  | $ | 8.1 |  |  | $ | 5.6 |
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 for the six and three months ended June 30, 2013 and 2012 were:
|  | Six Months Ended |  | Three Months Ended
(Dollars in Millions) |  | June 30, 2013 |  | June 30, 2012 |  | June 30, 2013 |  | June 30, 2012
Service Cost on Benefits Earned |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | — |
Interest Cost on Projected Benefit Obligation |  | 0.6 |  |  | 0.8 |  |  | 0.3 |  |  | 0.4 |
Amortization of Accumulated Unrecognized Actuarial Gain |  | (0.6 | ) |  | (0.6 | ) |  | (0.3 | ) |  | (0.5 | )
Total Postretirement Benefits Other than Pensions Expense |  | $ | 0.1 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | (0.1 | )

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=21916443&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2439-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2410-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4, 7, 16, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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