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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Apr. 01, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2016
Successor
Selected Quarterly Financial Information [Abstract]
Revenues		$ 1,397.1	$ 1,412.6	$ 1,309.4	$ 1,462.7	$ 1,517.1	$ 1,477.2	$ 1,258.3			$ 4,252.6	$ 5,581.8
Operating profit		126.8	130.3	165.3	239.2	301.7	209.5	152.6			663.8	661.6
Income (loss) from continuing operations, net of income taxes		233.5	83.9	120.0	208.3	378.0	233.7	101.4			713.1	645.7
Net income (loss)		260.6	79.8	116.4	207.0	364.6	230.0	98.7			693.3	663.8
Net income (loss) attributable to common stockholders		$ 252.6	$ 71.5	$ 113.7	$ 106.6	$ 317.4	$ 201.4	$ (20.2)			$ 498.6	$ 544.4
Basic EPS — continuing operations (1)		$ 1.99	$ 0.64	$ 0.94	$ 0.84	$ 2.50	$ 1.51	$ (0.18)			$ 3.85	$ 4.35
Diluted EPS — continuing operations (1)		$ 1.97	$ 0.63	$ 0.93	$ 0.83	$ 2.47	$ 1.49	$ (0.18)			$ 3.81	$ 4.28
Weighted average shares used in calculating basic EPS		113.1	118.6	124.5	120.9	104.8	101.6	96.8			101.1	119.3
Weighted average shares used in calculating diluted EPS		114.7	120.3	126.0	123.2	106.5	103.1	96.8			33.5	2.1
Predecessor
Selected Quarterly Financial Information [Abstract]
Revenues	$ 0.0								$ 1,326.2	$ 1,326.2			$ 4,715.3
Operating profit	0.0								212.5	212.5			(219.8)
Income (loss) from continuing operations, net of income taxes	(319.8)								(195.5)	124.3			(663.8)
Net income (loss)	(331.9)								(211.7)	120.2			(721.4)
Net income (loss) attributable to common stockholders	$ (331.9)								$ (216.5)	$ 115.4			$ (729.3)
Basic EPS — continuing operations (1)	$ (17.44)								$ (10.93)	$ 6.46			$ (36.72)
Diluted EPS — continuing operations (1)	$ (17.44)								$ (10.93)	$ 6.44			$ (36.72)
Weighted average shares used in calculating basic EPS	18.3								18.3	18.3			18.3
Weighted average shares used in calculating diluted EPS	18.3									18.4

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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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