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Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented (Tables) | 9 Months Ended
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Sep. 30, 2018
Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented [Abstract] |
Schedule of Adjustments Due to ASU 2014-09 [Table Text Block] | The cumulative effects to the Company’s consolidated January 1, 2018 balance sheet were to reduce retained earnings for the amount of revenue that would have been deferred and to reduce long-term customer receivables, as noted in the table below:
| Balance at December 31, 2017 |  | Adjustments due to ASU 2014-09 |  | Balance at January 1, 2018
| (Dollars in millions)
ASSETS |  |  |  |  |
Investments and other assets | $ | 470.6 |  |  | $ | (22.5 | ) |  | $ | 448.1 |
STOCKHOLDERS’ EQUITY |  |  |  |  |
Retained earnings | 613.6 |  |  | (22.5 | ) |  | 591.1 |
Schedule of the Impacts of ASU 2017-07 [Table Text Block] | The retrospective impacts to the unaudited condensed consolidated statements of operations were as follows:
| Successor
| Three Months Ended September 30, 2017
| Before Application of Accounting Guidance |  | Adjustment |  | After Application of Accounting Guidance
| (Dollars in millions)
Results of Operations Amounts |  |  |  |  |
Operating costs and expenses | $ | 1,046.0 |  |  | $ | (6.9 | ) |  | $ | 1,039.1 |
Selling and administrative expenses | 33.4 |  |  | 0.3 |  |  | 33.7 |
Operating profit | 202.9 |  |  | 6.6 |  |  | 209.5 |
Net periodic benefit costs, excluding service cost | — |  |  | 6.6 |  |  | 6.6 |
Income from continuing operations before income taxes | 149.6 |  |  | — |  |  | 149.6 |
| Successor
| April 2 through September 30, 2017
| Before Application of Accounting Guidance |  | Adjustment |  | After Application of Accounting Guidance
| (Dollars in millions)
Results of Operations Amounts |  |  |  |  |
Operating costs and expenses | $ | 1,980.8 |  |  | $ | (13.8 | ) |  | $ | 1,967.0 |
Selling and administrative expenses | 67.8 |  |  | 0.6 |  |  | 68.4 |
Operating profit | 348.9 |  |  | 13.2 |  |  | 362.1 |
Net periodic benefit costs, excluding service cost | — |  |  | 13.2 |  |  | 13.2 |
Income from continuing operations before income taxes | 255.7 |  |  | — |  |  | 255.7 |
| Predecessor
| January 1 through April 1, 2017
| Before Application of Accounting Guidance |  | Adjustment |  | After Application of Accounting Guidance
| (Dollars in millions)
Results of Operations Amounts |  |  |  |  |
Operating costs and expenses | $ | 963.7 |  |  | $ | (13.5 | ) |  | $ | 950.2 |
Selling and administrative expenses | 37.2 |  |  | (0.9 | ) |  | 36.3 |
Operating profit | 198.1 |  |  | 14.4 |  |  | 212.5 |
Net periodic benefit costs, excluding service cost | — |  |  | 14.4 |  |  | 14.4 |
Loss from continuing operations before income taxes | (459.3 | ) |  | — |  |  | (459.3 | )

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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