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Stock-based compensation and stockholders' equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Nov. 11, 2022 | Sep. 28, 2023 | Nov. 11, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock options granted (in shares) |  |  |  |  |  |  | 800,000 |  |  |  |
Nonvested options forfeited (in shares) |  |  |  |  |  |  | 900,000 |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 250.0
Stock repurchased during period, value |  |  |  | $ 23.3 | $ 52.2 |  |  |  |  |  |
Treasury Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchased during period, value |  |  |  | $ 23.3 | $ 52.2 |  |  | $ 75.5 | $ 187.9 |  |
Stock repurchased during period, shares (in shares) |  |  | 0 | 700,000 | 1,100,000 |  |  | 1,800,000 | 4,400,000 |  |
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) |  |  |  |  |  |  |  |  |  | 5,000,000 |
Number of shares issued (in shares) | 0 |  |  |  |  |  |  |  |  |  |
At-The-Market Offering |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, aggregate offering amount, maximum | $ 150.0 | $ 150.0 |  |  |  | $ 150.0 | $ 150.0 |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 0 |  |  |  | 1,100,000 |  |  |  |  |
Sale of stock, consideration received on transaction, gross |  |  |  |  |  | $ 9.1 |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ 8.22 | $ 8.22 |  |  |  | $ 8.22 | $ 8.22 |  |  |  |
Sale of stock, amount remaining available for sale of shares | $ 140.9 | $ 140.9 |  |  |  | $ 140.9 | $ 140.9 |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity instruments other than options granted (in shares) |  |  |  |  |  |  | 1,600,000 |  |  |  |
Equity instruments other than options, forfeited in period (in shares) |  |  |  |  |  |  | 700,000 |  |  |  |
Restricted Stock Units | Tranche One |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  |  |  | 33.33% |  |  |  |
Restricted Stock Units | Tranche Two |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  |  |  | 33.33% |  |  |  |
Restricted Stock Units | Tranche Three |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  |  |  | 33.33% |  |  |  |
Performance Shares |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity instruments other than options granted (in shares) |  |  |  |  |  |  | 500,000 |  |  |  |
Target payout percentage | 100.00% | 100.00% |  |  |  | 100.00% | 100.00% |  |  |  |
Maximum payout percentage | 200.00% | 200.00% |  |  |  | 200.00% | 200.00% |  |  |  |
Award vesting period |  |  |  |  |  |  | 3 years |  |  |  |
Equity instruments other than options, forfeited in period (in shares) |  |  |  |  |  |  | 300,000 |  |  |  |
Stock Options | Tranche One |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  |  |  | 33.33% |  |  |  |
Stock Options | Tranche Two |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  |  |  | 33.33% |  |  |  |
Stock Options | Tranche Three |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Award vesting rights, percentage |  |  |  |  |  |  | 33.33% |  |  |  |

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