Income taxes - Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
US	$ 112.0	$ 362.0	$ 63.9
International	202.4	45.2	13.5
Earnings before taxes on income	314.4	407.2	77.4
Federal tax at statutory rates	65.8	85.5	16.3
State taxes, net of federal benefit	16.1	23.2	10.3
Impact of foreign operations	(16.8)	(7.8)	(6.9)
Change in valuation allowance	4.3	1.5	(1.0)
Tax credits	(4.7)	(7.6)	(3.6)
Stock compensation	(4.9)	(7.9)	(2.4)
Impairments	8.3	0.0	0.0
Return to provision true-ups	0.8	(0.7)	(2.3)
Transaction costs	0.3	6.0	4.7
Compensation limitation	2.9	2.2	1.3
FIN 48	0.3	(0.3)	1.1
GILTI, net	11.4	5.4	3.6
Permanent differences	(0.3)	2.6	1.8
Total income taxes	$ 83.5	$ 102.1	$ 22.9

Effective Income Tax Rate Reconciliation, Compensation Limitation, Amount

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Amount, before tax, of income (loss) attributable to parent. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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