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Summary of Significant Accounting Policies Discussion (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of the Impacts of 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 consolidated statements of operations were as follows:
| Successor
| April 2 through December 31, 2017
| Before Application of Accounting Guidance |  | Adjustment |  | After Application of Accounting Guidance
| (Dollars in millions)
Results of Operations Amounts |  |  |  |  |
Operating costs and expenses | $ | 3,075.5 |  |  | $ | (22.8 | ) |  | $ | 3,052.7 |
Selling and administrative expenses | 105.4 |  |  | 0.9 |  |  | 106.3 |
Net mark-to-market adjustment on actuarially determined liabilities | (45.2 | ) |  | 45.2 |  |  | — |
Operating profit | 687.1 |  |  | (23.3 | ) |  | 663.8 |
Net periodic benefit costs, excluding service cost | — |  |  | 21.9 |  |  | 21.9 |
Net mark-to-market adjustment on actuarially determined liabilities | — |  |  | (45.2 | ) |  | (45.2 | )
Income from continuing operations before income taxes | 552.1 |  |  | — |  |  | 552.1 |
| 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 | )
| Predecessor
| Year Ended December 31, 2016
| Before Application of Accounting Guidance |  | Adjustment |  | After Application of Accounting Guidance
| (Dollars in millions)
Results of Operations Amounts |  |  |  |  |
Operating costs and expenses | $ | 4,123.1 |  |  | $ | (53.1 | ) |  | $ | 4,070.0 |
Selling and administrative expenses | 153.4 |  |  | (4.0 | ) |  | 149.4 |
Operating loss | (276.9 | ) |  | 57.1 |  |  | (219.8 | )
Net periodic benefit costs, excluding service cost | — |  |  | 57.1 |  |  | 57.1 |
Loss from continuing operations before income taxes | (758.3 | ) |  | — |  |  | (758.3 | )
Estimated useful life of plant and equipment | The estimated useful lives by category of assets are as follows:
|  |  | Years
Building and improvements |  |  | up to 27
Machinery and equipment |  |  | up to 27
Leasehold improvements |  |  | Shorter of Useful Life or Remaining Life of Lease

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