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Share-based compensation and stockholders' equity - Narrative (Details)	3 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) plan $ / shares shares	Dec. 31, 2023 USD ($) plan $ / shares shares	Dec. 31, 2023 USD ($) vote plan $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Nov. 11, 2022 USD ($) shares	Dec. 31, 2021 USD ($) $ / shares shares	Sep. 28, 2023 shares	Nov. 11, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock based employee compensation plans | plan	2	2	2
Contractual life of awards			7 years
Cash received from option exercises			$ 0	$ 500,000		$ 10,400,000
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares			$ 5.35	$ 17.85		$ 35.16
Total intrinsic value of options exercised			$ 0	$ 300,000		$ 15,700,000
Unrecognized compensation cost related to stock options	$ 4,400,000	$ 4,400,000	$ 4,400,000
Preferred stock, shares authorized (in shares) | shares	15,000,000	15,000,000	15,000,000	15,000,000.0
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001	$ 0.001	$ 0.001
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001	$ 0.001	$ 0.001		$ 0.001
Common stock, shares authorized (in shares) | shares	200,000,000	200,000,000	200,000,000	200,000,000.0
Common stock, voting rights | vote			1
Stock repurchase program, authorized amount								$ 250,000,000
Stock repurchased during period, value				$ 75,500,000		$ 112,600,000
Treasury Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased during period, value				$ 75,500,000	$ 187,900,000	$ 112,600,000
Shares of common stock repurchased (in shares) | shares				1,800,000	4,400,000	2,600,000
At-The-Market Offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate gross sales price	$ 150,000,000	$ 150,000,000	$ 150,000,000
Sale of stock, number of shares issued in transaction (in shares) | shares		1,100,000
Sale of stock, consideration received on transaction, gross		$ 9,100,000
Sale of stock, price per share (in dollars per share) | $ / shares	$ 8.22	$ 8.22	$ 8.22
Sale of stock, amount remaining available for sale of shares	$ 140,900,000	$ 140,900,000	$ 140,900,000
2023 Equity Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares) | shares	5,000,000	5,000,000	5,000,000				5,000,000
Number of shares issued (in shares) | shares	0
Employee Stock Option | 2006 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for issuance under the plan (in shares) | shares	29,100,000	29,100,000	29,100,000
Common stock available for future awards (in shares) | shares	5,900,000	5,900,000	5,900,000
Exercise price of option as percentage of fair market value at grant date, minimum	100.00%	100.00%	100.00%
Contractual life of awards			7 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of awards vested			$ 31,800,000	$ 30,900,000		$ 26,900,000
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount	$ 22,600,000	$ 22,600,000	$ 22,600,000
Weighted average period expected to be recognized related to unvested equity awards			1 year 9 months 18 days
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of awards vested			$ 2,400,000	$ 2,500,000		$ 3,800,000
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount	$ 2,200,000	$ 2,200,000	$ 2,200,000
Weighted average period expected to be recognized related to unvested equity awards			1 year 9 months 18 days
Vesting period			3 years
Performance Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout percentage			50.00%
Performance Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout percentage			200.00%

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