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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