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Summary Quarterly Financial Information Summary of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Apr. 01, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Successor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  | $ 1,517.1 |  | $ 1,477.2 |  | $ 1,258.3 |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,252.6 |  |
Operating income (loss) |  |  | 338.2 |  | 202.9 |  | 146.0 |  |  |  |  |  |  |  |  |  |  |  |  | 687.1 |  |
Income (loss) from continuing operations, net of tax, including portion attributable to noncontrolling interest |  |  | 378.0 |  | 233.7 |  | 101.4 |  |  |  |  |  |  |  |  |  |  |  |  | 713.1 |  |
Net income (loss), including portion attributable to noncontrolling interest |  |  | 364.6 |  | 230.0 |  | 98.7 |  |  |  |  |  |  |  |  |  |  |  |  | 693.3 |  |
Net Income (Loss) Attributable to Parent |  |  | $ 317.4 |  | $ 201.4 |  | $ (20.2) |  |  |  |  |  |  |  |  |  |  |  |  | $ 498.6 |  |
Income (loss) from continuing operations, per basic share |  |  | $ 2.50 | [1] | $ 1.51 | [1] | $ (0.18) | [1] |  |  |  |  |  |  |  |  |  |  |  | $ 3.85 |  |
Income (loss) from continuing operations, per diluted share |  |  | $ 2.47 | [1] | $ 1.49 | [1] | $ (0.18) | [1] |  |  |  |  |  |  |  |  |  |  |  | $ 3.81 |  |
Weighted average shares outstanding, basic |  |  | 104.8 |  | 101.6 |  | 96.8 |  |  |  |  |  |  |  |  |  |  |  |  | 101.1 |  |
Weighted average shares outstanding, diluted |  |  | 106.5 |  | 103.1 |  | 96.8 |  |  |  |  |  |  |  |  |  |  |  |  | 33.5 |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 0.0 |  |  |  |  |  |  |  | $ 1,326.2 | $ 1,326.2 |  | $ 1,440.8 |  | $ 1,207.1 |  | $ 1,040.2 |  | $ 1,027.2 |  |  | $ 4,715.3 | $ 5,609.2
Operating income (loss) | 0.0 |  |  |  |  |  |  |  | 198.1 | 198.1 |  | (44.9) |  | (21.6) |  | (107.7) |  | (102.7) |  |  | (276.9) | (1,464.8)
Income (loss) from continuing operations, net of tax, including portion attributable to noncontrolling interest | (319.8) |  |  |  |  |  |  |  | (195.5) | 124.3 |  | (175.2) |  | (97.7) |  | (223.2) |  | (167.7) |  |  | (663.8) | (1,783.2)
Net income (loss), including portion attributable to noncontrolling interest | (331.9) |  |  |  |  |  |  |  | (211.7) | 120.2 |  | (188.3) |  | (135.8) |  | (226.2) |  | (171.1) |  |  | (721.4) | (1,958.2)
Net Income (Loss) Attributable to Parent | $ (331.9) |  |  |  |  |  |  |  | $ (216.5) | $ 115.4 |  | $ (192.7) |  | $ (137.6) |  | $ (227.9) |  | $ (171.1) |  |  | $ (729.3) | $ (1,965.3)
Income (loss) from continuing operations, per basic share | $ (17.44) | [1] |  |  |  |  |  |  | $ (10.93) | $ 6.46 | [1] | $ (9.82) | [2] | $ (5.44) | [2] | $ (12.30) | [2] | $ (9.17) | [2] |  | $ (36.72) | $ (98.65)
Income (loss) from continuing operations, per diluted share | $ (17.44) | [1] |  |  |  |  |  |  | $ (10.93) | $ 6.44 | [1] |  |  |  |  |  |  |  |  |  | $ (36.72) | $ (98.65)
Weighted average shares outstanding, basic | 18.3 |  |  |  |  |  |  |  | 18.3 | 18.3 |  | 18.3 |  | 18.3 |  | 18.3 |  | 18.3 |  |  | 18.3 | 18.1
Weighted average shares outstanding, diluted | 18.3 |  |  |  |  |  |  |  |  | 18.4 |  |  |  |  |  |  |  |  |  |  |  |
[1] | EPS for the quarters may not sum to the amounts for the year as each period is computed on a discrete basis.
[2] | EPS for the quarters may not sum to the amounts for the year as each period is computed on a discrete basis

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