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Shareholders' Equity - Schedule of Treasury Shares (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Movement In Treasury Shares [Roll Forward] |  |  |
Beginning balance | $ 207.3 | $ 209.1 | $ 167.1
Purchase of treasury shares | (2.7) | (11.1) | (6.4)
Utilization of treasury shares | (0.1) | (0.4) | 0.0
Ending balance | 212.6 | 207.3 | 209.1
Treasury shares |  |  |
Movement In Treasury Shares [Roll Forward] |  |  |
Beginning balance | (20.4) | (9.6) | (4.0)
Purchase of treasury shares | (2.7) | (11.1) | (6.4)
Utilization of treasury shares | 0.2 | 0.3 | 0.1
Ending balance | $ (22.9) | $ (20.4) | $ (9.6)

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