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v3.25.1

Shareholders' equity - Narrative (Details) $ / shares in Units, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) director period $ / shares shares | Mar. 31, 2024 USD ($) shares | Dec. 31, 2024 $ / shares shares
Class of Stock [Line Items] |  |  |
Common shares authorized (in shares) | 300,000,000 |  |
Common shares, par value (in dollars per share) | $ / shares | $ 0.10 |  |
Dividends paid to common shareholders | $ | $ 0.0 | $ 0.0 |
Dividends paid to preference shareholders | $ | 4.0 | $ 4.0 |
Stock repurchase program, remaining authorized amount | $ | $ 180.8 |  |
Director |  |  |
Class of Stock [Line Items] |  |  |
Common shares repurchased and retired (in shares) | 500,000 |  |
Shares acquired price (in dollars per share) | $ / shares | $ 14.00 |  |
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common shares repurchased and retired (in shares) | 500,000 | 0 |
Preference shares |  |  |
Class of Stock [Line Items] |  |  |
Preference shares, shares authorized (in shares) | 30,000,000 |  |
Preference shares, par value (in dollars per share) | $ / shares | $ 0.10 |  |
Series B preference shares |  |  |
Class of Stock [Line Items] |  |  |
Preference shares, shares authorized (in shares) | 8,000,000 |  | 8,000,000
Preference shares, par value (in dollars per share) | $ / shares | $ 0.10 |  | $ 0.10
Preference shares, shares outstanding (in shares) | 8,000,000 |  |
Dividend rate | 8.00% |  |
Voting rights triggering event, number of dividend periods not paid | period | 6 |  |
Voting rights triggered, number of directors eligible to elect | director | 2 |  |
Dividend rate reset period | 5 years |  |
Dividend rate basis spread on variable rate | 7.298% |  |
Each five-year anniversary triggering event, redemption percentage | 100.00% |  |
Rating agency triggering event, redemption percentage | 102.00% |  |
Capital disqualification triggering event, redemption percentage | 100.00% |  |
Tax triggering event, redemption percentage | 100.00% |  |
Dividends paid to preference shareholders | $ | $ 4.0 | $ 4.0 |

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