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Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented - Adjustments Due to ASU 2017-07 (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Apr. 01, 2017 | Sep. 30, 2017 | Sep. 30, 2018
Successor |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating costs and expenses | $ 1,047.9 | $ 1,039.1 |  | $ 1,967.0 | $ 3,051.6
Selling and administrative expenses | 38.6 | 33.7 |  | 68.4 | 119.7
Operating profit | 130.3 | 209.5 |  | 362.1 | 534.8
Net periodic benefit costs, excluding service cost | (4.5) | (6.6) |  | (13.2) | (13.6)
Income from continuing operations before income taxes | $ 97.7 | 149.6 |  | 255.7 | 443.5
Adjustments due to ASU 2017-07 |  |  |  |  | $ (22.5)
Successor | Operating costs and expenses |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustments due to ASU 2017-07 |  | (6.9) |  | (13.8) |
Successor | Selling and administrative expenses |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustments due to ASU 2017-07 |  | 0.3 |  | 0.6 |
Successor | Operating profit |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustments due to ASU 2017-07 |  | 6.6 |  | 13.2 |
Successor | Net periodic benefit costs, excluding service cost |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustments due to ASU 2017-07 |  | 6.6 |  | 13.2 |
Successor | Income from continuing operations before income taxes |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustments due to ASU 2017-07 |  | 0.0 |  | 0.0 |
Successor | Before Adoption [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating costs and expenses |  | 1,046.0 |  | 1,980.8 |
Selling and administrative expenses |  | 33.4 |  | 67.8 |
Operating profit |  | 202.9 |  | 348.9 |
Net periodic benefit costs, excluding service cost |  | 0.0 |  | 0.0 |
Income from continuing operations before income taxes |  | $ 149.6 |  | $ 255.7 |
Predecessor |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating costs and expenses |  |  | $ 950.2 |  |
Selling and administrative expenses |  |  | 36.3 |  |
Operating profit |  |  | 212.5 |  |
Net periodic benefit costs, excluding service cost |  |  | (14.4) |  |
Income from continuing operations before income taxes |  |  | (459.3) |  |
Predecessor | Operating costs and expenses |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustments due to ASU 2017-07 |  |  | (13.5) |  |
Predecessor | Selling and administrative expenses |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustments due to ASU 2017-07 |  |  | (0.9) |  |
Predecessor | Operating profit |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustments due to ASU 2017-07 |  |  | 14.4 |  |
Predecessor | Net periodic benefit costs, excluding service cost |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustments due to ASU 2017-07 |  |  | 14.4 |  |
Predecessor | Income from continuing operations before income taxes |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Adjustments due to ASU 2017-07 |  |  | 0.0 |  |
Predecessor | Before Adoption [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating costs and expenses |  |  | 963.7 |  |
Selling and administrative expenses |  |  | 37.2 |  |
Operating profit |  |  | 198.1 |  |
Net periodic benefit costs, excluding service cost |  |  | 0.0 |  |
Income from continuing operations before income taxes |  |  | $ (459.3) |  |

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