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Income taxes - Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
U.S.	$ (805.1)	$ (442.6)	$ 100.1
International	73.9	224.0	203.3
Earnings (losses) before taxes on income	(731.2)	(218.6)	303.4
Federal tax at statutory rates	(153.6)	(46.0)	63.5
State taxes, net of federal benefit	(52.7)	(13.5)	14.1
Impact of foreign operations	(8.5)	(7.2)	(18.7)
Change in valuation allowance	193.6	37.8	8.2
Tax credits	(0.9)	(3.5)	(4.7)
Stock compensation	6.8	4.7	(3.9)
Goodwill Impairments	23.3	1.8	8.3
Adjustment of prior year taxes	1.3	(1.8)	0.8
Transaction costs	0.0	0.0	0.1
Compensation limitation	0.3	0.7	2.9
Unrecognized tax benefit	(0.6)	(9.0)	1.2
GILTI, net	17.8	20.7	13.0
Foreign withholding tax	0.8	4.7	0.0
Permanent differences	1.7	3.2	(1.2)
Income tax (benefit) provision	$ 29.3	$ (7.4)	$ 83.7

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