Basic net income (loss) per ordinary share is based on the weighted-average number of ordinary shares outstanding. Diluted net income (loss) per ordinary share is based on the weighted-average number of ordinary shares outstanding and potentially dilutive ordinary shares outstanding.


	Three Months Ended March 31,
		2026		2025
Numerator:


Net income (loss)		$	293.1	$	(92.5)



Denominator:
Weighted-average ordinary shares used in per share calculations - basic		61.9		61.0
Dilutive effect of employee equity incentive and purchase plans		2.7		—
Dilutive effect of the Exchangeable Senior Notes		1.5		—
Weighted-average ordinary shares used in per share calculations - diluted		66.1		61.0

Net income (loss) per ordinary share:



Basic		$	4.73	$	(1.52)



Diluted		$	4.43	$	(1.52)

Potentially dilutive ordinary shares from our employee equity incentive and purchase plans are determined by applying the treasury stock method to the assumed vesting of outstanding RSUs and PRSUs, the assumed exercise of share options and the assumed issuance of ordinary shares under our ESPP.

In July 2024, we irrevocably elected to fix the settlement method for exchanges of the 2026 Notes to a combination of cash and ordinary shares of the Company with a specified cash amount per $1,000 principal amount of 2026 Notes exchanged equal to or in excess of $1,000. As a result of the election, an exchanging holder will receive (i) up to $1,000 in cash per $1,000 principal amount of 2026 Notes exchanged and (ii) cash, ordinary shares, or any combination thereof, at our election, in respect of the remainder, if any, of its exchange obligation in excess of $1,000 per $1,000 principal amount of 2026 Notes exchanged. The conversion spread will have a dilutive impact on diluted net income per ordinary share when the average market price of our ordinary shares for a given period exceeds the conversion price, of approximately $155.81 per ordinary share, of the 2026 Notes. The average market price of our ordinary shares for the three months ended March 31, 2025 did not exceed the conversion price of the 2026 Notes.

For the 2030 Notes, we are required to settle the principal amount in cash and have the option to settle the conversion feature for the amount above the conversion price, or the conversion spread, in cash, ordinary shares or a combination of cash and ordinary shares. The conversion spread will have a dilutive impact on diluted net income per ordinary share when the average market price of our ordinary shares for a given period exceeds the conversion price, of approximately $153.05 per ordinary share, of the 2030 Notes. The average market price of our ordinary shares for the three months ended March 31, 2025 did not exceed the conversion price of the 2030 Notes.

The following table represents the weighted-average ordinary shares that were excluded from the calculation of diluted net income (loss) per ordinary share for the periods presented because including them would have an anti-dilutive effect (in millions):