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Summary of Significant Accounting Policies Discussion Adoption of ASU 2017-07 (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses |  |  |  |  |  |  |  |  | $ 950.2 | $ 3,045.1 | $ 3,536.6 | $ 4,071.4
Selling and administrative expenses |  |  |  |  |  |  |  |  | 36.3 | 106.3 | 145.0 | 158.1
Operating profit (loss) | $ (165.5) | $ (36.8) | $ 79.5 | $ 184.5 | $ 126.8 | $ 130.3 | $ 165.3 | $ 239.2 | 212.5 | 663.8 | 61.7 | 661.6
Net periodic benefit costs, excluding service cost |  |  |  |  |  |  |  |  | 14.4 | 21.9 | 19.4 | 18.1
Net mark-to-market adjustment on actuarially determined liabilities | $ 67.4 |  |  |  | $ 125.5 |  |  |  | 0.0 | (45.2) | 67.4 | (125.5)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | $ (459.3) | $ 552.1 | $ (142.3) | 664.1
Adjustment |  |  |  |  |  |  |  |  |  |  |  | $ 22.5

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