Summary of Significant Accounting Policies - Schedule of Restatement of Previously Issued Financial Statements (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended									6 Months Ended	9 Months Ended	12 Months Ended
	Feb. 07, 2020	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]
Error Corrections and Prior Period Adjustments Restatement [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 and Diluted (USD per share)						$ (0.29)		$ (0.12)	$ (0.16)	$ (0.63)			$ (1.07)	$ (1.19)		$ (2.65)
Current portion of warrant liabilities		68.5				$ 0.0							$ 68.5	$ 0.0
Total current liabilities		1,741.6				1,519.7							1,741.6	1,519.7
Warrant liabilities		87.7				0.0							87.7	0.0
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
Error Corrections and Prior Period Adjustments Restatement [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 and Diluted (USD per share)													$ (0.60)
Current portion of warrant liabilities		0.0											$ 0.0
Total current liabilities		1,673.1											1,673.1
Warrant liabilities		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
Revision of Prior Period, Error Correction, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Change in fair value of warrant liabilities	$ 116.4												143.7
Income (loss) from Continuing Operations before income taxes													(143.7)
Income (loss) from Continuing Operations													(143.7)
Net income (loss)													(143.7)
Comprehensive income (loss)													$ (143.7)
Basic and Diluted (USD per share)													$ (0.47)
Current portion of warrant liabilities		68.5											$ 68.5
Total current liabilities		68.5											68.5
Warrant liabilities		87.7											87.7
Total liabilities		156.2											156.2
Additional paid-in capital		(12.5)											(12.5)
Accumulated deficit		(143.7)											(143.7)
Total equity (deficit)		$ (156.2)											$ (156.2)

[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.