Quarterly Financial Information (unaudited and as restated) - Quarterly Information (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
Disaggregation of Revenue [Line Items]
Net sales	$ 1,305.5	$ 1,162.0	$ 1,005.7	$ 897.3	$ 1,171.5	$ 1,070.7	$ 1,134.1	$ 1,054.8			$ 4,370.6	$ 4,431.2	$ 4,285.6
Cost of sales	878.3	749.0	659.3	610.3	784.3	719.4	766.9	707.6			2,896.9	2,978.2	2,865.2
Selling, general and administrative expenses	265.5	251.7	226.3	264.8	291.8	259.3	263.3	286.4			1,008.4	1,100.8	1,223.8
Loss on extinguishment of debt	0.0	0.0	0.0	174.0	0.0	0.0	0.0	0.0			174.0	0.0	0.0
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
Other deductions, net	41.6	126.2	49.5	34.4	47.5	31.6	28.1	38.8			251.8	146.1	178.8
Interest expense, net	25.0	26.4	30.1	68.9	76.2	77.7	78.7	77.8			150.4	310.4	288.8
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 tax expense	20.2	24.5	14.3	13.8	5.6	(3.6)	16.0	18.5			72.7	36.5	49.9
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)
Earnings (loss) per share:
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)
Basic and Diluted (USD per share)					$ (0.29)	$ (0.12)	$ (0.16)	$ (0.63)			$ (1.07)	$ (1.19)	$ (2.65)
Weighted-average shares outstanding
Weighted-average number of ordinary shares outstanding - basic (in shares)	330,335,268	328,411,705	328,411,705	240,656,864							307,076,397	118,261,955	118,261,955
Weighted-average number of ordinary shares outstanding - diluted (in shares)	333,294,298	328,411,705	328,411,705	240,656,864							307,076,397	118,261,955	118,261,955
Weighted-average number of ordinary shares outstanding - basic and diluted (in shares)					118,261,955	118,261,955	118,261,955	118,261,955			307,076,397	118,261,955	118,261,955
Product
Disaggregation of Revenue [Line Items]
Net sales	$ 1,020.1	$ 891.1	$ 750.2	$ 647.2	$ 878.1	$ 799.4	$ 865.3	$ 813.3			$ 3,308.8	$ 3,356.1	$ 3,230.3
Cost of sales	715.1	596.7	515.3	463.2	607.9	561.4	613.6	566.2			2,290.5	2,349.2	2,274.5
Service
Disaggregation of Revenue [Line Items]
Net sales	285.4	270.9	255.5	250.1	293.4	271.3	268.8	241.5			1,061.8	1,075.1	1,055.3
Cost of sales	$ 163.2	$ 152.3	$ 144.0	$ 147.1	$ 176.4	$ 158.0	$ 153.3	$ 141.4			$ 606.4	$ 629.0	$ 590.7