Quarterly Financial Information (unaudited and as restated) - Schedule of Restatement By Quarter (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended									6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017	[1]
Disaggregation of Revenue [Line Items]
Change in fair value of warrant liabilities	$ 34.4	$ 87.7	$ 82.2	$ (60.6)						$ 21.6	$ 109.3	$ 143.7	$ 0.0		$ 0.0
Income (loss) from Continuing Operations before income taxes	60.7	(79.0)	(41.7)	(194.5)	$ (28.3)		$ (17.3)	$ (2.9)	$ (55.8)	(236.2)	(315.2)	(254.6)	(104.3)		(271.0)
Income (loss) from Continuing Operations	40.5	(103.5)	(56.0)	(208.3)						(264.3)	(367.8)	(327.3)	(140.8)		(320.9)
Net income (loss)	40.5	(103.5)	(56.0)	(208.3)	(33.9)		$ (13.7)	$ (18.9)	$ (74.3)	(264.3)	(367.8)	(327.3)	(140.8)		(314.0)
Comprehensive income (loss)	$ 103.1	$ (70.8)	$ (65.3)	$ (260.9)						$ (326.2)	$ (397.0)	$ (293.9)	$ (164.5)		$ (405.7)
Basic (USD per share)	$ 0.12	$ (0.32)	$ (0.17)	$ (0.87)						$ (0.93)	$ (1.22)	$ (1.07)	$ (1.19)		$ (2.65)
Diluted (USD per share)	$ 0.12	$ (0.32)	$ (0.17)	$ (0.87)						$ (0.93)	$ (1.22)	$ (1.07)	$ (1.19)		$ (2.65)
Warrant liabilities		$ 225.6	$ 137.9	$ 55.7						$ 137.9	$ 225.6
Total liabilities	$ 4,561.7	4,625.6	4,516.9	4,353.7	5,362.2					4,516.9	4,625.6	$ 4,561.7	$ 5,362.2
Additional paid-in capital	1,791.8	1,525.6	1,521.7	1,519.6	277.7					1,521.7	1,525.6	1,791.8	277.7
Accumulated deficit	(1,331.2)	(1,368.4)	(1,264.9)	(1,208.9)	(1,000.6)					(1,264.9)	(1,368.4)	(1,331.2)	(1,000.6)
Total equity (deficit)	512.1	146.1	213.0	276.2	$ (704.8)	[1]				213.0	146.1	512.1	$ (704.8)	[1]	$ (540.3)	[1]	$ (129.6)
Previously Reported
Disaggregation of Revenue [Line Items]
Change in fair value of warrant liabilities	0.0	0.0	0.0	0.0						0.0	0.0	0.0
Income (loss) from Continuing Operations before income taxes	95.1	8.7	40.5	(255.1)						(214.6)	(205.9)	(110.9)
Income (loss) from Continuing Operations	74.9	(15.8)	26.2	(268.9)						(242.7)	(258.5)	(183.6)
Net income (loss)	74.9	(15.8)	26.2	(268.9)						(242.7)	(258.5)	(183.6)
Comprehensive income (loss)	$ 137.5	$ 16.9	$ 16.9	$ (321.5)						$ (304.6)	$ (287.7)	(150.2)
Basic (USD per share)	$ 0.23	$ (0.05)	$ 0.08	$ (1.12)						$ (0.85)	$ (0.86)
Diluted (USD per share)	$ 0.22	$ (0.05)	$ 0.08	$ (1.12)						$ (0.85)	$ (0.86)
Warrant liabilities		$ 0.0	$ 0.0	$ 0.0						$ 0.0	$ 0.0
Total liabilities	$ 4,405.5	4,400.0	4,379.0	4,298.0						4,379.0	4,400.0	4,405.5
Additional paid-in capital	1,804.3	1,641.9	1,638.0	1,635.9						1,638.0	1,641.9	1,804.3
Accumulated deficit	(1,187.5)	(1,259.1)	(1,243.3)	(1,269.5)						(1,243.3)	(1,259.1)	(1,187.5)
Total equity (deficit)	668.3	371.7	350.9	331.9						350.9	371.7	$ 668.3
Restatement Adjustment
Disaggregation of Revenue [Line Items]
Change in fair value of warrant liabilities	34.4	87.7	82.2	(60.6)						21.6	109.3
Income (loss) from Continuing Operations before income taxes	(34.4)	(87.7)	(82.2)	60.6						(21.6)	(109.3)
Income (loss) from Continuing Operations	(34.4)	(87.7)	(82.2)	60.6						(21.6)	(109.3)
Net income (loss)	(34.4)	(87.7)	(82.2)	60.6						(21.6)	(109.3)
Comprehensive income (loss)	$ (34.4)	$ (87.7)	$ (82.2)	$ 60.6						$ (21.6)	$ (109.3)
Basic (USD per share)	$ (0.11)	$ (0.27)	$ (0.25)	$ 0.25						$ (0.08)	$ (0.36)
Diluted (USD per share)	$ (0.10)	$ (0.27)	$ (0.25)	$ 0.25						$ (0.08)	$ (0.36)
Warrant liabilities		$ 225.6	$ 137.9	$ 55.7						$ 137.9	$ 225.6
Total liabilities		225.6	137.9	55.7						137.9	225.6
Additional paid-in capital		(116.3)	(116.3)	(116.3)						(116.3)	(116.3)
Accumulated deficit		(109.3)	(21.6)	60.6						(21.6)	(109.3)
Total equity (deficit)		$ (225.6)	$ (137.9)	$ (55.7)						$ (137.9)	$ (225.6)

[1] As a result of the restatement the merger recapitalization has been reduced by the fair value of $116.4 of Warrants as a liability as of February 7, 2020.